apropos
1. [ adverb ] at an opportune time
Synonyms: timely well-timed seasonably
Examples:

"your letter arrived apropos"

Related terms: timely seasonable
2. [ adverb ] by the way
Synonyms: incidentally
Examples:

"apropos, can you lend me some money for the weekend?"

3. [ adjective ] of an appropriate or pertinent nature
Related terms: malapropos apposite appropriate appropriateness
Similar spelling:   Aphrophora