We found 30 dictionaries that define the word yawning:

General (19 matching dictionaries)

1. yawning: Merriam-Webster
2. yawning: Oxford Learner's Dictionaries
3. yawning: American Heritage Dictionary of the English Language
4. yawning: Collins English Dictionary
5. yawning: Vocabulary.com
6. Yawning, yawning: Wordnik
7. yawning: Cambridge Advanced Learner's Dictionary
8. yawning: Wiktionary
9. yawning: Infoplease Dictionary
10. yawning: Dictionary.com
11. yawning: Cambridge Essential American English Dictionary
12. Yawning: Wikipedia, the Free Encyclopedia
13. Yawning: Online Plain Text English Dictionary
14. yawning: Rhymezone
15. Yawning: AllWords.com Multi-Lingual Dictionary
16. yawning: Webster's 1828 Dictionary
17. yawning: FreeDictionary.org
18. yawning: Mnemonic Dictionary
19. yawning: TheFreeDictionary.com

Business (1 matching dictionary)

20. yawning: Legal dictionary

Medicine (8 matching dictionaries)

21. yawning: Merriam-Webster Medical Dictionary
22. Dorland's Illustrated Medical Dictionary (No longer online)
23. Yawning: MedTerms.com Medical Dictionary
24. Medical Dictionary (No longer online)
25. Yawning: MedFriendly Glossary
26. online medical dictionary (No longer online)
27. yawning: Medical dictionary
28. Yawning: Drug Medical Dictionary

Miscellaneous (1 matching dictionary)

29. Brilliant Dream Dictionary (No longer online)

Slang (1 matching dictionary)

30. Yawning: Urban Dictionary

(Note: See yawn as well.)

Definitions from Wiktionary (yawning) ▸ noun:  The action of the verb yawn. ▸ adjective:  That yawns or yawn. ▸ adjective:  (figuratively) Wide open. Similar: oscitant, drowsy, open, inattentive, jawn, gape, oscitation, oscitancy, yawn-sigh, snoring, more... Opposite: blinking, winking Types: spontaneous, reflex, psychogenic, voluntary, more... Phrases: excessive yawning, Tales from the Yawning Portal, Yawning Man, yawning or astonished, yawning void, more... Adjectives: frequent, excessive, much, grave, wide, constant, spasmodic, contagious, induced, violent, long Colors:     pale blue,     soft lavender,     muted gray,     gentle beige,     light pink, more... ▸ Words similar to yawning ▸ Usage examples for yawning ▸ Idioms related to yawning ▸ Wikipedia articles (New!) ▸ Popular adjectives describing yawning ▸ Popular nouns described by yawning ▸ Words that often appear near yawning ▸ Rhymes of yawning ▸ Invented words related to yawning