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English definition of “proper”

proper

adjective  /ˈprɑp·ər/ us  

proper adjective (SUITABLE)

fitting or right for a particular situation; suitable: We didn’t have the proper tools to do the job right. With proper treatment she should recover completely.

proper adjective (CORRECT)

[not gradable] correct, or considered to be correct: The coach showed him the proper way to hold a bat.

proper adjective (SOCIALLY ACCEPTABLE)

according to socially accepted standards of behavior: I didn’t think it was proper to just invite myself in.

proper adjective (CENTRAL)

[only after n, not gradable] being in the central or main part or place: They live in the suburbs, not in Boston proper.
(Definition of proper from the Cambridge Academic Content Dictionary © Cambridge University Press)
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