definev. t.[OE. definer, usually, to end, to finish, F. dfinir to define, L. definire to limit, define; de- + finire to limit, end, finis boundary, limit, end. See Final, Finish.]1. To fix the bounds of; to bring to a termination; to end.(Barrow.)2. To determine or clearly exhibit the boundaries of; to mark the limits of; as, to define the extent of a kingdom or country.()3. To determine with precision; to mark out with distinctness; to ascertain or exhibit clearly; as, the defining power of an optical instrument.()Rings . . . very distinct and well defined. (Sir I. Newton.)4. To determine the precise signification of; to fix the meaning of; to describe accurately; to explain; to expound or interpret; as, to define a word, a phrase, or a scientific term.()They define virtue to be life ordered according to nature. (Robynson (More's Utopia).)v. i. To determine; to decide.()