v.tr. 1 give the exact meaning of (a word etc.). 2 describe or explain the scope of (define one's position). 3 make clear, esp. in outline (well-defined image). 4 mark out the boundary or limits of. 5 (of properties) make up the total character of. definable adj. definer n.
[ ME f. OF definer ult. f. L definire (as DE-, finire finish, f. finis end) ]