suffix /ˈsʌfɪks/noun 3verb 3forms 4 noun3 •A morpheme added at the end of a word to modify the word's meaning.The suffix "-able" changes "sing" into "singable". •A final segment of a string of characters.The string "abra" is both a prefix and a suffix of the string "abracadabra". •A subscript. verb3 •To append (something) to the end of something else.[...] by suffixing the ending -or to collaborat-, the stem of collaboratus, pp. of collaborare, to work together with. — 1882 •To cause (something) to be appended with something else at its end.[...] by suffixing the verb with the gerundive suffix [...] — 2013 •To treat or use as a suffix. formssuffixed · suffixing · suffixes · suffices