Definition of apropos preposition from the Oxford Advanced Learner's Dictionary

 

apropos

 preposition
preposition
BrE BrE//ˌæprəˈpəʊ//
 
; NAmE NAmE//ˌæprəˈpoʊ//
 
(also apropos of)
 
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concerning or related to somebody/something Apropos (of) what you were just saying… Word Origin mid 17th cent.: from French à propos ‘(with regard) to (this) purpose’.
See the Oxford Advanced American Dictionary entry: apropos