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

§ 10. Illustrative Examples

It is common knowledge that all dictionaries save those of a narrowly restricted purpose, such as, e.g., frequency dictionaries, spelling books, etymological, pronouncing, ideographic or reverse dictionaries, provide illustrative examples.
• The purpose of these examples depends on the type of the dictionary and on the aim the compilers set themselves. They can illustrate the first and the last known occurrences of the entry word, the successive changes in its graphic and phonetic forms, as well as in its meaning, the typical patterns and collocations, the difference between synonymous words, they place words in a context to clarify their meanings and usage.
When are illustrative examples to be used? Which words may be listed without illustrations? Should illustrative sentences be made up, or should they always be quotations of some authors? How much space should be devoted to illustrative examples? Which examples should be chosen as typical?
Those are some of the questions to be considered.
In principle only some technical terms that are monosemantic can, if precisely defined, be presented without examples even in a large dictionary. In practice, however, because of space considerations this is not the case. It is natural that the bigger the dictionary the more examples it usually contains. Only very small dictionaries, usually of low quality, do not include examples at all.
As to the nature of examples, diachronic dictionaries make use of quotations drawn from literary sources, while in synchronic dictionaries quoted examples are preferred by big dictionaries, in middle-size dictionaries illustrative sentences and phrases drawn from classical and contemporary sources or those constructed by the compilers are employed.
The form of the illustrative quotations can differ in different dictionaries; the main variation can be observed in the length of the quotation and in the precision of the citation.
Some dictionaries indicate the author, the work, the page, verse, or line, and (in diachronic dictionaries) the precise date of the publication, some indicate only the author, because it gives at least basic orientation about the time when the word occurs and the type of text.
It is necessary to stress the fact that word-meanings can be explained
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not only with the help of definitions and examples but also by means of showing their collocability (lexical and grammatical valency ¹), especially their typical collocability.