/ ˈsʌfɪks; NAmE / noun
( grammar ) a letter or group of letters added to the end of a word to make another word, such as -ly in quickly or -ness in sadness
—compare affix , prefix
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WORD ORIGIN
late 18th cent. (as a noun): from modern Latin suffixum , neuter past participle (used as a noun) of Latin suffigere , from sub- subordinately + figere fasten.