Plain language: A specialised vocabulary, a curated set of words and definitions for a particular field or subject area, distinct from a general dictionary.

Technical: A domain-specific vocabulary that organises terminology within a particular discipline or community of practice. Unlike a general dictionary, a lexicon is bounded by subject area and typically includes contextual guidance on usage.

Misconception: A lexicon is the same as a dictionary. A dictionary covers general vocabulary of a language; a lexicon is specific to one domain and reflects the conventions of a professional or academic community.

Real-world example: A medical lexicon contains terms like 'tachycardia' and 'myocardial infarction'. This AI lexicon contains terms like 'prompt' and 'hallucination', words with specific meanings in AI contexts that differ from everyday use.

Related terms: AI · Prompt · Algorithm