As a noun relevancy
is (legal|scotland) sufficieny (of a statement, claim etc) to carry weight in law; legal pertinence.
As an adjective suitable is
having sufficient or the required properties for a certain purpose or task; appropriate to a certain occasion.
(legal, Scotland) Sufficieny (of a statement, claim etc.) to carry weight in law; legal pertinence.
(uncountable) The degree to which a thing is relevant; relevance, applicability.
*1842 , (Edgar Allan Poe), ‘The Myster of Marie Rogêt’:
*:It is the malpractice of the courts to confine evidence and discussion to the bounds of apparent relevancy .
(countable) A relevant thing.
* In contemporary usage (relevance) is about 20 times more common in the US (COCA) and about 50 times more common in the UK (BNC) than this term.
Having sufficient or the required properties for a certain purpose or task; appropriate to a certain occasion.
* fit for purpose (British)
* up to standard (British)