Webster's English Dictionary

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suffix

1. suf.fix \'s*f-.iks\ \'s*f-.ik-s*l, (.)s*-'fik-s*l\ n [NL suffixum, fr. 
   L, neut. of suffixus, pp. of suffigere to f]asten underneath, fr. sub- + 
   figere to fasten - more at DIKE 1: an affix occurring at the end of a word, 
   base, or phrase  2: SUBINDEX  - suf.fix.al aj
2. suf.fix \'s*f-.iks, (.)s*-'fiks\ \.s*f-.ik-'sa--sh*n\ vt : to attach as 
   a suffix  - suf.fix.ation n