adj. & adv.
--adj.
1. to the point or purpose; appropriate (his comment was apropos).
2 colloq. (often foll. by of) in respect of; concerning (apropos the meeting; apropos of the talk).
--adv.
1. appropriately (spoke apropos).
2 (absol.) by the way; incidentally ( apropos, she's not going).
Etymology: F {agrave} propos f. {agrave} to + propos PURPOSE