(1) To determine or clearly mark the outlines or limits of.
(2) To express the precise signification of.
(3) To state the meaning of; to describe precisely; to explain or expound; to interpret.
(4) To bring to a termination or bounds of; to end.
Word origin: Latin definire (“‘to limit, settle, define’”) < de- + finire (“‘to set a limit, bound, end’”