We found 19 dictionaries that define the word rationalness:

General (14 matching dictionaries)

1. rationalness: Merriam-Webster
2. rationalness: Collins English Dictionary
3. rationalness: Vocabulary.com
4. rationalness: Wordnik
5. rationalness: Wiktionary
6. Rationalness, rationalness: Dictionary.com
7. Rationalness: Online Plain Text English Dictionary
8. rationalness: Webster's Revised Unabridged, 1913 Edition
9. rationalness: Rhymezone
10. Rationalness: AllWords.com Multi-Lingual Dictionary
11. rationalness: Webster's 1828 Dictionary
12. rationalness: FreeDictionary.org
13. rationalness: Mnemonic Dictionary
14. Rationalness: TheFreeDictionary.com

Business (2 matching dictionaries)

15. rationalness: Merriam-Webster Legal Dictionary
16. rationalness: Legal dictionary

Computing (1 matching dictionary)

17. rationalness: Encyclopedia

Medicine (2 matching dictionaries)

18. rationalness: Merriam-Webster Medical Dictionary
19. rationalness: Medical dictionary

(Note: See rational as well.)

Definitions from Wiktionary (rationalness) ▸ noun:  (archaic) The quality or state of being rational. Similar: rationality, arationality, irrationalness, rationalizability, irrationability, reasonableness, irrationality, unrationality, wertrationality, antirationality, more... ▸ Words similar to rationalness ▸ Usage examples for rationalness ▸ Idioms related to rationalness ▸ Wikipedia articles (New!) ▸ Popular adjectives describing rationalness ▸ Words that often appear near rationalness ▸ Rhymes of rationalness ▸ Invented words related to rationalness