Affix

An affix is a piece added to a word, or root,Root = the part of a word which does not change. which signals or changes its role in a sentence. It is part of grammar.McArthur, Tom (ed) 1992. The Oxford companion to the English language. Oxford University Press.p18 Affixes may occur in various positions in a word:

 Prefix: before the word/root, for instance: anti-climax; re-write.
 Suffix: after the word/root, for instance: climactic; walked. Most plurals.
 Infix: Inside the word/root. Rare in English, example: the m in recumbent.
 Interfix: between words, to connect them: the reduced and in sun 'n sand; editor-in-chief.

 References 

 Related pages 
Inflection

Category:Grammar
Category:Linguistics terminology