Belonging or related to the subject or matter in hand; fit or appropriate in any way; adapted to the end proposed; apposite; material; relevant; as, pertinent illustrations or arguments; pertinent evidence.
source: Webster 1913
adjective satellite
having precise or logical relevance to the matter at hand
A list of articles pertinent to the discussion. Remarks that were to the point.
source: WordNet 3.0
being of striking appropriateness and pertinence
The successful copywriter is a master of apposite and evocative verbal images. An apt reply.