What is definition apropo?

The term "apropos" is an adjective or adverb that means to be relevant, suitable, or appropriate to a particular situation or circumstance. It can also refer to a remark made in passing that is related to the current topic of conversation. In French, the word "apropos" means "to the purpose" or "to the point." The term is often used in formal writing, such as academic papers or professional communications, to indicate a relevant or necessary point. In casual conversation, it may be used to acknowledge a relevant idea or comment made by someone else.