1. preposition Something which is apropos, or apropos of, a subject or event, is connected with it or relevant to it. [formal] ⇒ All my suggestions apropos the script were accepted. ⇒ George Orwell once asked, apropos of publishers, 'Why don't they just say, "We don't want your poems"?' 2. preposition Apropos or apropos of is used to introduce something that you are going to say which is related to the subject you have just been talking about. [formal] ⇒ Apropos Dudley Moore living in California he said, 'He loves the space, Californians have a lot of space.' 3. graded adjective [v-link ADJ]
Something that is apropos is very suitable in a particular situation. [formal] appropriate ⇒ It was a verse from the book of Job. It was so apropos.
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