De-fine'1, v. t.
[imp. & p. p. DEFINED; p. pr. & vb. n. DEFINING.] [Lat. definire, from de and finire, to limit, to end, from finis, a boundary, limit, end, Fr. définir, Pr., Sp., & Pg. definir, It. definire.]
Sense 1. To fix the bounds of; to bring to a termination; to end. “To define controversies.” Barrow.
Sense 2. To determine or clearly exhibit the boundaries of; to mark the limits of; as, to define the extent of a kingdom or country. “Rings . . . very distinct and well defined.” Newton.
Sense 3. To determine with precision; to mark out with distinctness; to ascertain or exhibit clearly; as, the defining power of an optical instrument.
Sense 4. To determine the precise signification of; to fix the meaning of; to explain; to expound or interpret; as to define a word, a phrase, or a scientific term.