The Affixation reference article from the English Wikipedia on 24-Jul-2004
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Affixation

Time you got around to sponsoring a child
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
manicure
Circumfix* mor + root + pheme
gesucht

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

See also