Source : Webster's Revised Unabridged Dictionary (1913)

Pertinent \Per"ti*nent\, 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.

   2. Regarding; concerning; belonging; pertaining. [R.]
      ``Pertinent unto faith.'' --Hooker.

   Syn: Apposite; relevant; suitable; appropriate; fit. --
        {Per"ti*nent*ly}, adv. -- {Per"ti*nent*ness}, n.

Source : WordNet®

pertinently
     adv : in a pertinent way; "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"