We found 30 dictionaries that define the word tranquil:

General (26 matching dictionaries)

1. tranquil: Longman Dictionary of Contemporary English
2. tranquil: Merriam-Webster
3. tranquil: Oxford Learner's Dictionaries
4. tranquil: American Heritage Dictionary of the English Language
5. tranquil: Collins English Dictionary
6. tranquil: Vocabulary.com
7. Tranquil, tranquil: Wordnik
8. tranquil: Cambridge Advanced Learner's Dictionary
9. tranquil: Wiktionary
10. tranquil: Webster's New World College Dictionary, 4th Ed.
11. tranquil: The Wordsmyth English Dictionary-Thesaurus
12. tranquil: Infoplease Dictionary
13. tranquil: Dictionary.com
14. tranquil: Cambridge Essential American English Dictionary
15. Tranquil (disambiguation), Tranquil: Wikipedia, the Free Encyclopedia
16. Tranquil: Online Plain Text English Dictionary
17. tranquil: Webster's Revised Unabridged, 1913 Edition
18. tranquil: Rhymezone
19. tranquil: AllWords.com Multi-Lingual Dictionary
20. tranquil: Webster's 1828 Dictionary
21. tranquil: FreeDictionary.org
22. tranquil: TheFreeDictionary.com
23. tranquil: Wikimedia Commons US English Pronunciations
24. tranquil: Mnemonic Dictionary

Business (1 matching dictionary)

25. tranquil: Legal dictionary

Computing (2 matching dictionaries)

26. TRANQUIL: Free On-line Dictionary of Computing
27. TRANQUIL: Encyclopedia

Medicine (1 matching dictionary)

28. online medical dictionary (No longer online)

(Note: See tranquilly as well.)

Definitions from Wiktionary ( ) ▸ adjective:  Free from emotional or mental disturbance. ▸ adjective:  Calm; without motion or sound. Similar: placid, serene, calm, quiet, still, peaceful, unruffled, untroubled, unworried, relaxed, more... Opposite: agitated, disturbed, troubled, uneasy, restless Types: calm, serene, peaceful, relaxed, tranquilizing, soothing, meditative, quiet, more... Phrases: Tranquil Salvador III, more tranquil, tranquil discipline, not tranquil, opposite of tranquil, more... Adjectives: most, same, rest, long, present, last, beautiful, whole, usual, least, old Colors:     sky blue,     lavender,     soft pink,     pale yellow,     mint green, more... ▸ Words similar to tranquil ▸ Usage examples for tranquil ▸ Idioms related to tranquil ▸ Wikipedia articles (New!) ▸ Popular nouns described by tranquil ▸ Words that often appear near tranquil ▸ Rhymes of tranquil ▸ Invented words related to tranquil