A prefix is a word,letter or number Placed before another..
- For example, the word "unhappy" consists of the prefix "un-" [which means "not"] combined with the root (stem) word "happy"; the word "unhappy" means "not happy.
- " A suffix is a group of letters placed after the root of a word.noun1.Grammar. an affix placed before a word, base, or another prefix to modify a term's meaning, as by making the term negative, as un- in unkind, by signaling repetition, as re- in reinvent, or by indicating support, as pro- in proabolition.Compatible prefixes can work together, as un-and re- in unrefundable.2.something prefixed, as a title before a person's name: She used the prefix “Ms.” rather than “Lady” at the law office where she worked.verb (used with object)3.to fix or put before or in front: to prefix an impressive title to one's name.4.Grammar. to add as a prefix. 5.to fix, settle, or determine beforehand: If you call a taxi, the rate to the airport will be prefixed.6.Biology. to apply the first of two fixatives to. Origin Expandlate Middle EnglishMiddle FrenchLatin