Etymology
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apropos (adv.)

1660s, "opportunely," from French à propos "to the purpose," from propos "thing said in conversation, talk; purpose, plan," from Latin propositium "purpose," past participle of proponere "to set forth, propose" (see propound). Meaning "as regards, with reference to" (with of) is 1761, from French. As an adjective, "to the point or purpose," from 1690s.

updated on January 31, 2017

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Definitions of apropos from WordNet
1
apropos (adv.)
at an opportune time;
your letter arrived apropos
Synonyms: seasonably / timely / well-timed
apropos (adv.)
introducing a different topic;
Synonyms: by the way / by the bye / incidentally
2
apropos (adj.)
of an appropriate or pertinent nature;
From wordnet.princeton.edu, not affiliated with etymonline.