Something pertinent is relevant and on-point. If you give your best friend pertinent advice, that means the advice is appropriate for the situation.

Something pertinent is related to the current topic or situation — and probably helpful too. If you're in math class and you make a comment about World War I, that's likely not pertinent. If you're in music class and you talk about a cello, that probably is pertinent. Pertinent things are appropriate and logical. In most situations, people like to get comments and questions that are pertinent — anything else can just seem like a distraction.

Definitions of pertinent

adj being of striking appropriateness and pertinence

apposite, apt
of an appropriate or pertinent nature

adj having precise or logical relevance to the matter at hand

“a list of articles pertinent to the discussion”
having a bearing on or connection with the subject at issue

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