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English definition of “suffix”

suffix

noun [C] uk   /ˈsʌf.ɪks/ us  
B2 a letter or group of letters added at the end of a word to make a new word: The suffix '-ness' added to the end of the word 'sweet' forms the word 'sweetness', changing an adjective into a noun.
Grammar
(Definition of suffix from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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