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The definition of apropos

4 Definitions of: apropos

    1. adjective, appropriate; pertinent
    2. adverb, appropriately or pertinently
    3. adverb, by the way; incidentally
    4. adverb, apropos of with regard to; in respect of
    5. Show me some examples of this word: apropos
    6. Show me the etymology of the word: apropos

From Collins