pɹəˈpɔɹʃən pɹəˈpɔːʃən ˈɹeɪ.ʃoʊ ˈɹeɪ.ʃi.əʊ the relation between things (or parts of things) with respect to their comparative quantity, magnitude, or degree an inordinate proportion of the book is given over to quotations a dry martini has a large proportion of gin the relative magnitudes of two quantities (usually expressed as a quotient)