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affix (v.)

"fasten, join, attach," 1530s, from Medieval Latin affixare, frequentative of Latin affigere (past participle affixus) "fasten to, attach," from ad "to" (see ad-) + figere "to fasten" (from PIE root *dheigw- "to stick, fix").

According to OED first used by Scottish writers and thus perhaps the immediate source was Middle French affixer, a temporarily re-Latinized spelling of Old French afichier (Modern French afficher), from a Medieval Latin variant of the Latin verb. The older form in English was affitch (Middle English afficchen, late 14c.), from Old French afichier. Related: Affixed; affixt; affixing.

affix (n.)

"that which is joined or attached," 1610s, from affix (v.) or from French affixe, noun use of the adjective from the verb in French. Related: Affixal.

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Definitions of affix from WordNet
1
affix (v.)
attach to;
affix the seal here
Synonyms: stick on
affix (v.)
add to the very end;
Synonyms: append / add on / supplement
affix (v.)
attach or become attached to a stem word;
grammatical morphemes affix to the stem
2
affix (n.)
a linguistic element added to a word to produce an inflected or derived form;
From wordnet.princeton.edu