"affixing" 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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