We found 20 dictionaries that define the word affixation:

General (14 matching dictionaries)

1. affixation: Merriam-Webster
2. affixation: Oxford Learner's Dictionaries
3. affixation: Collins English Dictionary
4. affixation: Vocabulary.com
5. affixation: Wordnik
6. affixation: Wiktionary
7. affixation: Webster's New World College Dictionary, 4th Ed.
8. affixation: Infoplease Dictionary
9. affixation: Dictionary.com
10. Affixation: Wikipedia, the Free Encyclopedia
11. affixation: Rhymezone
12. affixation: FreeDictionary.org
13. affixation: Mnemonic Dictionary
14. affixation: TheFreeDictionary.com

Art (2 matching dictionaries)

15. Linguistic Glossary (No longer online)
16. Affixation: Lexicon of Linguistics

Business (2 matching dictionaries)

17. affixation: Merriam-Webster Legal Dictionary
18. affixation: Legal dictionary

Computing (1 matching dictionary)

19. affixation: Encyclopedia

Miscellaneous (1 matching dictionary)

20. affixation: Idioms

(Note: See affix as well.)

Definitions from Wiktionary (affixation) ▸ noun:  (linguistics) The adding of an affix to a word. Similar: affixion, affixture, infixation, affixer, infixion, confix, interfix, interfixation, affixative, adjunction, more... Opposite: deletion, unaffixation, unprefixation Adjectives: inflectional, syntactic, verbal, derivational, further, morphological, pronominal, zero, phrasal, productive, simple ▸ Words similar to affixation ▸ Usage examples for affixation ▸ Idioms related to affixation ▸ Wikipedia articles (New!) ▸ Popular adjectives describing affixation ▸ Words that often appear near affixation ▸ Rhymes of affixation ▸ Invented words related to affixation