Defines

verb

1. To determine with precision; to mark out with distinctness; to ascertain or exhibit clearly.

   "the defining power of an optical instrument"

2. To settle, decide (an argument etc.)
3. To express the essential nature of something.

   "I define myself as a techno-anarchist."

4. To state the meaning of a word, phrase, sign, or symbol.

   "The textbook defined speed as velocity divided by time."

5. To describe, explain, or make definite and clear; used to request the listener or other person to elaborate or explain more clearly his or her intended meaning of a word or expression.

   "Person 1: Is she good at math?"