R. S. Ginzburg, S. S. Khidekel, G. Y. Knyazeva, A. A. Sankin a course in modern english

§ 9. Definition of Meanings

Meanings of words may be defined in different ways: 1) by means of definitions that are characterised as encyclopaedic, 2) by means of descriptive definitions or paraphrases, 3) with the help of synonymous words and expressions, 4) by means of cross-references.
Encyclopaedic definitions as distinct from descriptive definitions determine not only the word-meaning, but also the underlying concept.
COD coal ft. 1. Hard opaque black or blackish mineral or vegetable matter found in seams or strata below earth’s surface and used as fuel and in manufacture of gas, tar, etc. ANTHRACITE, BITUMINOUS COAL, LIGNITE; ...
Synonymous definitions consist of words or word-groups with nearly equivalent meaning, as distinct from descriptive definitions which are explanations with the help of words not synonymous with the word to be defined.
For example, in the two entries for despicable given above COD defines the word-meaning with the help of synonyms, while WNWD uses both descriptive and synonymous definitions.
Reference to other words as a means of semantisation can be illustrated with the following examples taken from COD:
defense. See defence decrescendo. = diminuendo
It is the descriptive definitions that are used in an overwhelming majority of entries. While the general tendency is the same, words belonging to different parts of speech and to different groups within them have their own peculiarities. Encyclopaedic definitions are typical of nouns, especially proper nouns and terms. Synonyms are used most
¹ See p. 223.
² See also a detailed comparison of the entries for the word anecdote in four dictionaries made by Mathews (Readings in English Lexicology, pp. 196-201).
220
often to define verbs and adjectives. Reference to other words is resorted to define some derivatives, abbreviations and variant forms.
Apart from the nature of the word to be defined the type of definitions given preference depends on the aim of the dictionary and its size. For instance encyclopaedic definitions play a very important role in unabridged dictionaries (especially those published in America); in middle-size dictionaries they are used for the most part to define ethnographic and historical concepts. Synonymous definitions play a secondary role in unabridged dictionaries where they are used as an addition to descriptive or encyclopaedic definitions, and are much more important in shorter dictionaries, probably because they are a convenient means to economise space.