Definition of "vocabulary"

vocabulary

/vəʊˈkabjʊləɹɪ/

noun
countable and uncountable, plural vocabularies
1. A usually alphabetized and explained collection of words e.g. of a particular field, or prepared for a specific purpose, often for learning.
2. The collection of words a person knows and uses.
3. The stock of words used in a particular field.
4. The words of a language collectively; lexis.
  Quotations
  Vocabulary provides a foundation from which grammar, phonology, and morphology emerge, and in a subject area it provides access to conceptual knowledge. Vocabulary selection for pedagogical purposes is therefore crucial.
  2018, Clarence Green, James Lambert, “Advancing disciplinary literacy through English for academic purposes: Discipline-specific wordlists, collocations and word families for eight secondary subjects”, in Journal of English for Academic Purposes, volume 35, page 106
5. (by extension) A range of artistic or stylistic forms or techniques.