(adj) having precise or logical relevance to the matter at hand, Example:a list of articles pertinent to the discussion; remarks that were to the point
(adv) in a pertinent way, Example:what is singular about his use of them is that no other artist, of his time or any other, has painted them so directly, intimately and pertinently
The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)
a. [ L. pertinens, -entis, p. pr. of pertinere: cf. F. pertinent. See Pertain. ] 1. 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. [ 1913 Webster ]