a statement that makes something comprehensible by describing the relevant structure or operation or circumstances etc.

give a definition for the meaning of a word

a definition in which the term is used by embedding it in a larger expression containing its explanation

a definition that reports the standard uses of a word or phrase or symbol

a definition that gives an exact equivalent of the term defined

a definition that points out or exhibits instances of the term defined

(mathematics) a definition of a function from which values of the function can be calculated in a finite number of steps