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.

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Definitions of apropos
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