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. 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. (Math.) A subscript mark, number, or letter. See Subscript, a.