Affix
From UNLwiki
An affix is a morpheme that is attached to a word stem to form a new word. Affixes may be derivational, like English -ness and pre-, or inflectional, like English plural -s and past tense -ed. They are bound morphemes by definition, and are further classified according to their position: beginning (prefixation), the middle (infixation) or the end (suffixation).
