4. (Logic) An exact enunciation of the constituents which make up the logical essence.
5. (Opt.) Distinctness or clearness, as of an image formed by an optical instrument; precision in detail.
Syn. -- Definition, Explanation, Description. A definition is designed to settle a thing in its compass and extent; an explanation is intended to remove some obscurity or misunderstanding, and is therefore more extended and minute; a description enters into striking particulars with a view to interest or impress by graphic effect. It is not therefore true, though often said, that description is only an extended definition. "Logicians distinguish definitions into essential and accidental. An essential definition states what are regarded as the constituent parts of the essence of that which is to be defined; and an accidental definition lays down what are regarded as circumstances belonging to it, viz., properties or accidents, such as causes, effects, etc." Whately.
Def`i*ni"tion*al (?), a. Relating to definition; of the nature of a definition; employed in defining.
De*fin"i*tive (?), a. [L. definitivus: cf. F. définitif.] 1. Determinate; positive; final; conclusive; unconditional; express.
A strict and definitive truth.
Sir T. Browne.
Some definitive . . . scheme of reconciliation.
Prescott.