IPA: /ˈpɜːrtɪnənt/
KK: /ˈpɜrtɪnənt/
This word describes something that is directly related to the topic or issue being discussed.
The lawyer presented pertinent evidence that helped the case.
Pertinent is formed from "pertinere" (meaning to relate or pertain) which is a combination of "per-" (meaning through) and "tenere" (meaning to hold). The word describes something that holds relevance or is related to the matter at hand.
Think of something that 'holds' ('tenere') 'through' ('per-') a discussion — that's why pertinent means it is relevant or related to the topic.