lexicon.

1. The vocabulary of a language, speaker or defined domain, considered as a set.

2. A dictionary or reference work presenting vocabulary, especially for a particular language or field.

Use it for

Words that belong together

• technical lexicon
• personal lexicon

On the page

The technical lexicon included terms whose ordinary meanings differed from their specialized uses.

The character’s personal lexicon changed as she entered an unfamiliar field.

Usage notes

Primary category: academic / formal. Forms: Singular lexicon; plural lexicons or lexica. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings. Established modern English lexical item. No separate regional spelling or grammatical inflection entry. Writing functions: language analysis, sense distinction, word formation analysis, precise reference. Disciplines: academic writing, linguistics, dictionary and usage analysis. Commonness: moderately common.