Definition of affix noun from the Oxford Advanced Learner's Dictionary

BrE BrE//ˈæfɪks//
; NAmE NAmE//ˈæfɪks//
(grammar) a letter or group of letters added to the beginning or end of a word to change its meaning. The prefix un- in unhappy and the suffix -less in careless are both affixes. See related entries: Grammar
Word Originlate Middle English: from Old French affixer or medieval Latin affixare, frequentative of Latin affigere, from ad- ‘to’ + figere ‘to fix’.
See the Oxford Advanced American Dictionary entry: affix

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