"affix" in the noun sense

1. affix

a linguistic element added to a word to produce an inflected or derived form

"affix" in the verb sense

1. affix, stick on

attach to

"affix the seal here"

2. append, add on, supplement, affix

add to the very end

"He appended a glossary to his novel where he used an invented language"

3. affix

attach or become attached to a stem word

"grammatical morphemes affix to the stem"

Source: WordNet® (An amazing lexical database of English)

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