affix

US /əˈfɪks/
UK /əˈfɪks/
"affix" picture
1.

add to, attach to, or append to something

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The label was affixed to the package.
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Please affix a stamp to the envelope.
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attachfastenjoinconnectsecure
1.

an addition to the base form or stem of a word, such as a prefix or suffix

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The word 'unhappy' has the affix 'un-'.
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Prefixes and suffixes are types of affixes.
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morphemeprefixsuffix