(1):

(a.) Having certain or distinct; determinate in extent or greatness; limited; fixed; as, definite dimensions; a definite measure; a definite period or interval.

(2):

(a.) Determined; resolved.

(3):

(a.) Having certain limits in signification; determinate; certain; precise; fixed; exact; clear; as, a definite word, term, or expression.

(4):

(n.) A thing defined or determined.

(5):

(a.) Serving to define or restrict; limiting; determining; as, the definite article.