'apropos' definitions:

Definition of 'apropos'

From: WordNet
adverb
At an opportune time; "your letter arrived apropos" [syn: seasonably, timely, well-timed, apropos]
adverb
Introducing a different topic; in point of fact; "incidentally, I won't go to the party" [syn: by the way, by the bye, incidentally, apropos]
adjective
Of an appropriate or pertinent nature [ant: malapropos]