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

 

suffix

 noun
noun
BrE BrE//ˈsʌfɪks//
 
; NAmE NAmE//ˈsʌfɪks//
 
(grammar) Grammar
 
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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 See related entries: Grammar 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’.
See the Oxford Advanced American Dictionary entry: suffix