define

Concise Oxford English Dictionary © 2008 Oxford University Press:
define/dɪˈfʌɪn/

▶verb

• 1 state or describe exactly the nature, scope, or meaning of.

  ■ give the meaning of (a word or phrase).

• 2 mark out the limits of.

– derivatives
definable adjective,
definer noun.

– origin ME: from OFr. definer, from a var. of L. definire, from de- (expressing completion) + finire ‘finish’.