Affixation occurs when a bound morpheme is attached to a root morpheme.

Types of affixes
Prefix	morpheme + root
	undo
Suffix	root + morpheme
	looking
Infix*	root + morpheme + root
	unfuckingbelievable
Circumfix**	mor + root + pheme
	gesucht

*English infixes only exist in exclamatory cunstructions like the example given.

**English circumfixes do not exist. The example given is the German word for "searched".

See also

• free morpheme
• morphology
• morphosyntax