Affix has 6 different meanings across 2 categories:
Noun · Verb
a linguistic element added to a word to produce an inflected or derived form
That which is affixed; an appendage.
attach to
"affix the seal here"
add to the very end
"He appended a glossary to his novel where he used an invented language"
attach or become attached to a stem word
"grammatical morphemes affix to the stem"
To attach.
The word comes from the Latin affixus, meaning "fastened to," which is derived from the verb affigere. Although it looks like it could be split into English parts "a-" and "fix," its true origin lies in this single Latin root.