definition vs define

definition is a noun but define is not a noun.

Word	Noun	Adjective	Verb	Adverb
definition	Yes	No	No	No
define	No	No	Yes	No

definition (noun)	define (noun)
clarity of outline
a concise explanation of the meaning of a word or phrase or symbol

definition (verb)	define (verb)
	give a definition for the meaning of a word
	decide upon or fix definitely
	determine the essential quality of
	determine the nature of
	show the form or outline of