Pronunciation: [ pur-tn-uhnt ]
Definition: adjective
pertaining or relating directly and significantly to the matter at hand; relevant

Origin: Late Middle English; Latin
Etymology: from Old French, or from Latin pertinent- ‘having reference to’, from the verb pertinere
Usage:

Synonyms:
admissible
applicable
appropriate
related
relevant
Antonyms:
improper
inapplicable
inappropriate
irrelevant
unrelated
Example:
The parents left a list of all the pertinent contacts for the babysitter in case of emergency.