Context-aware definitions with adaptive complexity. Simple words get concise definitions; technical terms get etymology, multiple senses, and cross-domain treatment. Trigger keywords: define, what does X mean, explain term, etymology, word origin, affect vs effect.
Match response depth to term sophistication:
Label etymological claims as [Speculation] unless citing authoritative sources. For contested terms, present multiple definitions rather than one as authoritative.
Pitfalls: Avoid circular definitions (defining terms using variations of themselves). Don't define unfamiliar terms with equally unfamiliar jargon.