SUFFIX

suffix. Suffix, n. a letter or syllable annexed

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Suf″fix (?), n. [[L. suffixus, p. p. of suffigere to fasten on, to affix; sub under + figere to fix: cf. F. suffixe. See Fix.]] 1. 1. A letter, letters, syllable, or syllables added or appended to the end of a word or a root to modify the meaning; a postfix.
2. 2. (Math.) A subscript mark, number, or letter. See Subscript, a.