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English definition of “affix”

affix

verb [T] uk   /əˈfɪks/ formal us  
to fix one thing to another: She affixed a stamp to the envelope.

affix

noun [C] uk   /ˈæf.ɪks/ us  
a letter or group of letters added to the beginning or end of a word to make a new word: The affixes un- and -less are often used to make negative words, such as "unhappy" and "careless".
(Definition of affix from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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