affix

(noun) a linguistic element added to a word to produce an inflected or derived form.

(verb) attach to. Synonyms: stick on. Example: "Affix the seal here."

(verb) add to the very end. Synonyms: append, add on, supplement. Example: "He appended a glossary to his novel where he used an invented language."

(verb) attach or become attached to a stem word. Example: "Grammatical morphemes affix to the stem."