We found 12 dictionaries that define the word -ion:

General (11 matching dictionaries)

1. -ion: Merriam-Webster
2. -ion: Oxford Learner's Dictionaries
3. -ion: Collins English Dictionary
4. -ion: Wordnik
5. -ion: Cambridge Advanced Learner's Dictionary
6. -ion: Wiktionary
7. -ion: Webster's New World College Dictionary, 4th Ed.
8. -ion: The Wordsmyth English Dictionary-Thesaurus
9. -ion: Dictionary.com
10. -ion: Online Plain Text English Dictionary
11. -ion: MyWord.info

Medicine (1 matching dictionary)

12. -ion: Medical dictionary

Opposite: deion, anion ▸ Words similar to -ion ▸ Usage examples for -ion ▸ Idioms related to -ion ▸ Wikipedia articles (New!) ▸ Words that often appear near -ion ▸ Rhymes of -ion ▸ Invented words related to -ion