in-between vs mediate

in-between and mediate both are adjectives.

Word	Noun	Adjective	Verb	Adverb
in-between	No	Yes	No	No
mediate	No	Yes	Yes	No

As adjectives, in-between and mediate are synonyms defined as:

in-between and mediate: being neither at the beginning nor at the end in a series

Other synonyms of in-between include middle.

in-between (adjective)	mediate (adjective)
being neither at the beginning nor at the end in a series	acting through or dependent on an intervening agency
	being neither at the beginning nor at the end in a series

in-between (verb)	mediate (verb)
	act between parties with a view to reconciling differences
	occupy an intermediate or middle position or form a connecting link or stage between two others