What is the meaning of affix?

noun

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

verb

• Attach to.
  • usage: "affix the seal here"
  • synonyms: stick on
• Add to the very end.
  • usage: "He appended a glossary to his novel where he used an invented language"
  • synonyms: append, add on, supplement
• Attach or become attached to a stem word.
  • usage: "grammatical morphemes affix to the stem"