Pertinent, a.
Etymology: [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.
Shades of meaning
Fernald lists pertinent only as an antonym, under alien.
He lists it without comment; the entries above explain its neighbors.
Synonyms
none given