Defined vs Specified - What's the difference?

As verbs the difference between defined and specified

is that defined is past tense of define while specified is past tense of specify.

is that defined is having a definition or value while specified is thoroughly explained; adequately commented.

(wikipedia defined)

(head)

(define)

(en adjective)

Having a definition or value.

(bodybuilding) Having extreme muscle separation as a result of low body fat.

* (having a definition or value) undefined

(en adjective)

Thoroughly explained; adequately commented.

* unspecified

(head)

(specify)