Definition of: suffix

(suf′iks) noun
1. Ling. A letter or letters added to the end of a word or root, and functioning as a formative, derivative, or inflectional element, as –er in shorter, –ful in faithful, –s and –es in dogs, boxes, –ed in loved, –ness in kindness, etc. Compare COMBINING FORM, PREFIX.
2. Any added title or the like.
3. Math. A subindex.
—v.t. To add as a suffix; append. [<NL suffixum <L suffixus, pp. of suffigere <sub- underneath + figere fix. Doublet of SOFFIT.]
—suf′fix·al adjective
—suf·fix·ion (sə·fik′shən) noun