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The Glossary defines terms used in the Introduction and throughout the schedules, tables, and Manual.
Fuller explanations and examples for many terms may be found in the relevant sections of the Introduction.
An index to the Introduction and Glossary follows the Glossary.
Abridged edition: A shortened version of the Dewey Decimal Classification (DDC) system that is a
logical truncation of the notational and structural hierarchy of the corresponding full edition on which it is
based. The abridged edition is intended for general collections of 20,000 titles or less. See also Broad
classification; Full edition.
Add note: A note instructing the classifier to append digits found elsewhere in the DDC to a given base
number. See also Base number.
Add table: See Tables (2).
Application: See Rule of application.
Approximate the whole: When a topic is nearly coextensive with the full meaning of a DDC class, the
topic is said to “approximate the whole” of the class. The term is also used to characterize topics that cover
more than half the content of a class. When a topic approximates the whole of a class, standard
subdivisions may be added. Topics that do not approximate the whole are said to be in “standing room” in
the number. See also Class-here note; Standard-subdivisions-are-added note; Standing room.
Area table: An auxiliary table (Table 2) that gives geographic areas primarily, but also lists historical
periods and several numbers for persons associated with a subject. Areas of the world are listed
systematically, not alphabetically. Area table notation may be used with other numbers in the schedules
and tables when explicit instructions permitting such use are given. See also Tables.
Arrange-alphabetically note: A note suggesting the option of alphabetical subarrangement when
identification by specific name or other identifying characteristic is desired. See also Option .
Arrange-chronologically note: A note suggesting the option of chronological subarrangement when
identification by date is desired. See also Option .
Artificial digit: A letter or other symbol used optionally as a substitute for digits 0–9 to provide a more
prominent location or shorter notation for a jurisdiction, language, literature, religion, ethnic or national
group, or other characteristic. See also Option .
Aspect: An approach to a subject, or characteristic (facet) of a subject. See also Discipline; Facet;
Subject.
Attraction: See Classification by attraction.
Author number: See Book number.
Base number: A number of any length to which other numbers are appended. See also Add note.
Book number: The part of a call number that distinguishes a specific item from other items within the
same class number. A library using the Cutter-Sanborn system can have D548d indicate David Copperfield
by Dickens (where D stands for the D of Dickens, 548 stands for “ickens,” and d stands for David
Copperfield). See also Call number; Cutter number; Work mark.
Broad classification: The classification of works in broad categories by logical abridgment, even when
more specific numbers are available, e.g., the use of 641.5 Cooking instead of 641.5972 Mexican cooking
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for a cookbook of Mexican recipes. Broad classification is the opposite of close classification. See also
Abridged edition; Close classification.
Built number: A number constructed according to add instructions stated or implied in the schedules or
tables. See also Number building.
Call number: A set of letters, numerals, or other symbols (in combination or alone) used by a library to
identify a specific copy of a work. A call number may consist of the class number; book number; and other
data such as date, volume number, copy number, and location symbol. See also Book number; Class
number.
Caption: See Heading.
Category: See Class (Noun).
Centered entry: An entry representing a subject covered by a span of numbers, e.g., 372–374 Specific
levels of education. The entry is called “centered” because the span of numbers appears in the center of the
page in the print version of the DDC rather than in the number column on the left side of the page.
Centered entries are identified by the symbol > in the number column.
Characteristic of division: See Facet.
Citation order: The order in which two or more characteristics (facets) of a class are to be combined in
number building. When number building is not permitted or possible, instructions on preference order with
respect to the choice of facets are provided . See also Facet; Number building; Preference order.
Class: (Noun) (1) A group of objects exhibiting one or more common characteristics, identified by specific
notation. See also Entry (1). (2) One of the ten major groups of the DDC numbered 0–9 . See also Main
class. (3) A subdivision of the DDC of any degree of specificity. See also Subdivision. (Verb) To assign
a class number to an individual work . See also Classify.
Class-elsewhere note: A note instructing the classifier about the location of interrelated topics. The note
may show preference order, lead to the interdisciplinary or comprehensive number, override the first-of-
two rule, or lead to broader or narrower numbers in the same hierarchical array that might otherwise be
overlooked . See also Comprehensive number; Interdisciplinary number; Preference order.
Class-here note: A note that identifies topics that are equivalent to the whole of the class under which the
note appears. The topic as a whole is classed in the number under which the note appears; parts of the topic
are classed in the most appropriate subdivision of the number. Topics identified in class-here notes, even if
broader or narrower than the heading, are said to “approximate the whole” of the number; therefore,
standard subdivisions may be added for topics in class-here notes. Class-here notes also may identify the
comprehensive or interdisciplinary number for a subject. See also Approximate the whole;
Comprehensive number; Interdisciplinary number.
Class number: Notation that designates the class to which a given item belongs. See also Call number.
Classification: A logical system for the arrangement of knowledge.
Classification by attraction: The classification of a specific aspect of a subject in an inappropriate
discipline, usually because the subject is named in the inappropriate discipline but not mentioned explicitly
in the appropriate discipline.
Classified catalog: A catalog arranged according to the notational order of a classification system.
Classify: (1) To arrange a collection of items according to a classification system. (2) To assign a class
number to an individual work.
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Close classification: The classification of works to the fullest extent permitted by the notation. Close
classification is the opposite of broad classification. See also Broad classification; Full edition.
Coextensive: Describes a topic equal in scope to the concept represented by the number.
Comparative table: A table provided for a complete or extensive revision that lists in alphabetical order
selected topics accompanied by their previous number and their number in the current edition. See also
Equivalence table; Revision.
Complete revision: See Revision (Complete revision).
Complex subject: A complex subject is a subject that has more than one characteristic. For example,
“unemployed carpenters” is a complex subject because it has more than one characteristic (employment
status and occupation). See also Preference order.
Comprehensive number: A number (often identified by a “Class here comprehensive works” note) that
covers all the components of the subject treated within that discipline. The components may be in a span of
consecutive numbers or distributed throughout the schedule or table. See also Interdisciplinary number.
Coordinate: Describes a number or topic at a level equal to another number or topic in the same
hierarchy.
Cross classification: The accidental placement of works on the same subject in two different class
numbers. This tends to happen when works being classified deal with two or more characteristics of a
subject in the same class. Notes on preference order should prevent cross classification. See also
Preference order.
Cross reference: See Class-elsewhere note ; See-also reference ; See reference .
Cutter number: The notation in a book number derived from the Cutter Three-Figure Author Table, the
Cutter-Sanborn Three-Figure Author Table, or the OCLC Four-Figure Cutter Tables. The OCLC Four-
Figure Cutter Tables are revised and expanded versions of the Cutter Three-Figure Author Table and the
Cutter-Sanborn Three-Figure Author Table. See also Book number.
DDC: Dewey Decimal Classification.
DDC Summaries : A listing of the first three levels (main classes, divisions, and sections) of the Dewey
Decimal Classification system. The headings associated with the numbers in the summaries have been
edited for browsing purposes, and may not match the complete headings found in the schedules. See also
Division; Main class; Section; Summary.
Decimal point: The dot that follows the third digit in a DDC number. In strict usage the word “decimal”
is not accurate; however, common usage is followed in this edition’s explanatory material.
Definition note: A note indicating the meaning of a term in the heading.
Digit: The smallest individual unit in a notational system. For example, the notation 954 has three digits:
9, 5, and 4.
Discipline: An organized field of study or branch of knowledge, e.g., 200 Religion, 530 Physics, 364
Criminology. In the DDC, subjects are arranged by disciplines. See also Subject.
Discontinuation: The shifting of a topic or the entire contents of a number to a more general number in
the same hierarchy, or the complete removal of the topic or number. A topic or number is discontinued
because the topic or concept represented by the number has a negligible current literature or represents a
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distinction that is no longer valid in the literature or common perception of the field. A note explaining its
shift or removal accompanies a discontinued topic or number. Discontinued numbers appear in square
brackets. See also Relocation ; Schedule reduction.
Displaced standard subdivision: A standard subdivision concept given special notation in the schedule in
place of its regular notation from Table 1. A do-not-use note is always provided at the regular location of
the standard subdivision concept. See also Do-not-use note; Standard subdivisions.
Division : The second level of subdivision in the DDC, represented by the first two digits in the notation,
e.g., 64 in 640 Home and family management. See also DDC Summaries ; Main class ; Section.
Do-not-use note: A note instructing the classifier not to use all or part of a regular standard subdivision
notation or an add table provision, but instead to use a special provision or standard subdivision notation at
a broader number. See also Displaced standard subdivision.
Document: A generic term for all media capable of conveying, coding, and preserving knowledge.
Documents may be books, journals, electronic resources, reports, sound recordings, motion pictures, etc.
Dual heading: A heading with two separate terms, the first of which is the main topic and the second of
which is a major subordinate topic, e.g., 570 Life sciences Biology. A dual heading is used when the
subject as a whole and the subordinate topic as a whole share the same number and most of its
subdivisions. Standard subdivisions may be added for either or both topics in a dual heading.
Dual provision: The inadvertent provision of more than one place in the DDC for the same aspect of a
subject.
Entry: (1) In the schedules and tables, a self-contained unit consisting of a number or span of numbers, a
heading, and often one or more notes. (2) In the Relative Index, a term or phrase usually followed by a
DDC number. (3) In the Manual, a self-contained unit consisting of a number or group of numbers, the
associated headings or topics, and an extended instruction or discussion.
Enumerative scheme: A classification system in which numbers for complex subjects are precombined
and listed.
Equivalence table: A table provided for a complete or extensive revision that lists in numerical order the
classes of the current edition with their equivalent numbers in the previous edition (and vice versa). See
also Revision.
Expansion: The development of a class in the schedules or tables to provide further subdivisions . See also
Revision.
Extensive revision: See Revision (Extensive revision).
Facet: Any of the various categories into which a given class may be divided, e.g., division of the class
“people” into the categories of ethnicity, age, education, and language spoken. Each category contains
terms based on a single characteristic of division, e.g., children, adolescents, and adults are characteristics
of division of the “ages” category. See also Citation order.
Facet indicator: A digit used to introduce notation representing a characteristic of the subject. For
example, “0” is often used as a facet indicator to introduce standard subdivision concepts.
First-of-two rule: The rule instructing that works dealing equally with two subjects that are not used to
introduce or explain one another are classed in the number coming first in the schedules or tables.
Footnote : An instruction that applies to many subdivisions of a class, or to a topic within a class. The
affected subdivision or topic is marked with a symbol such as an asterisk. In the print version of the DDC,
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the footnote is located at the bottom of the page. In the electronic version, the footnote is included in the
notes section of each class to which the instruction applies.
Former-heading note: A note listing the heading associated with the class number in the previous edition.
The note is used when the heading has changed so much that it bears little or no resemblance to the
previous heading, even though the meaning of the number has remained substantially the same.
Full edition: The complete version of the Dewey Decimal Classification (DDC) system. See also
Abridged edition; Close classification.
Heading: The word or phrase used as the description of a given class. Also called “caption.”
Hierarchical force: The principle that the attributes of a class as defined in the heading and in certain
basic notes apply to all the subdivisions of the class, and to all other classes to which reference is made.
Hierarchy: The arrangement of a classification system from general to specific. In the DDC, the length of
the notation and the corresponding depth of indention of the heading usually indicate the degree of
specificity of a class. Hierarchy may also be indicated by special headings, notes, and centered entries.
Hook number: A number in the DDC without meaning in itself, but used to introduce examples of the
topic. Hook numbers have headings that begin with “Miscellaneous,” “Specific,” or “Other”; and do not
contain add notes, including notes, or class-here notes. Standard subdivisions are always bracketed under
hook numbers.
Including note: A note enumerating topics that are logically part of the class but are less extensive in
scope than the concept represented by the class number. These topics do not have enough literature to
warrant their own number. Standard subdivisions may not be added to the numbers for these topics. See
also Literary warrant ; Standing room .
Indention: Typographical setting of notes and subheadings below and to the right of the main entry term.
Influence : See Rule of application .
Interdisciplinary number: A number (often identified by a “Class here interdisciplinary works” note) to
be used for works covering a subject from the perspective of more than one discipline, including the
discipline where the interdisciplinary number is located, e.g., the interdisciplinary number for marriage is
306.81 in Sociology. See also Comprehensive number.
Literary form: A mode of literary expression such as poetry, drama, fiction, etc. Each form can be
subdivided into kinds of forms, e.g., lyric poetry, comedy, science fiction, etc.
Literary warrant: Justification for the development of a class or the explicit inclusion of a topic in the
schedules, tables, or Relative Index, based on the existence of a body of literature on the topic.
Main class: One of the ten major subdivisions of the DDC, represented by the first digit in the notation,
e.g., 3 in 300 Social sciences. See also DDC Summaries; Division; Section.
Manual: A guide to the use of the DDC that is made up primarily of extended discussions of problem
areas in the application of the DDC. In the schedules and tables, see-Manual references indicate where
relevant discussions are located in the Manual. See also Manual note .
Manual note : An individual entry in the Manual. See also Entry (3); Manual; See-Manual reference.
Notation: Numerals, letters, and/or symbols used to represent the main and subordinate divisions of a
classification scheme. In the DDC, Arabic numerals are used to represent the classes, e.g., notation 07
from Table 1 and 511.3 from the schedules.
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