A usually alphabetized and explained collection of words e.g. of a particular field, or prepared for a specific purpose, often for learning. / The collection of words a person knows and uses.

plural of vocabulary

(in combination) Having a vocabulary (of a specified kind or size).

(education, US) A word which a student is expected to learn; a word included in a test of one's general vocabulary or of subject-specific terminology

plural of vocabulary word

The collection of words and phrases that someone commonly uses in speech and writing.

The words and phrases, collectively, that someone understands in speech and writing but does not commonly use.

(slang) Off-color or obscene vocabulary; especially, four-letter words.

(information science) A carefully selected set of terms - words and phrases - such that each concept from the domain of discourse is described using only one term in the set and each term in the set describes only one concept.

(lexicography) A restricted set of words used to define all other terms in a dictionary.