We found 25 dictionaries that define the word trial and error:

General (18 matching dictionaries)

1. trial and error: Merriam-Webster
2. trial and error: Oxford Learner's Dictionaries
3. trial and error: American Heritage Dictionary of the English Language
4. trial and error: Collins English Dictionary
5. trial-and-error, trial and error: Vocabulary.com
6. trial and error: Wordnik
7. trial and error: Cambridge Advanced Learner's Dictionary
8. trial and error: Wiktionary
9. trial and error: The Wordsmyth English Dictionary-Thesaurus
10. trial and error: Infoplease Dictionary
11. trial-and-error, trial and error: Dictionary.com
12. Trial and Error (TV series), Trial and Error, Trial-and-error, Trial and error (disambiguation), Trial and error: Wikipedia, the Free Encyclopedia
13. trial-and-error, trial and error: Rhymezone
14. trial-and-error, trial and error: FreeDictionary.org
15. trial-and-error, trial and error: Mnemonic Dictionary
16. trial-and-error, trial and error: TheFreeDictionary.com

Business (2 matching dictionaries)

17. MoneyGlossary.com (No longer online)
18. trial-and-error: Legal dictionary

Computing (1 matching dictionary)

19. trial-and-error, trial and error: Encyclopedia

Medicine (2 matching dictionaries)

20. online medical dictionary (No longer online)
21. trial-and-error: Medical dictionary

Miscellaneous (1 matching dictionary)

22. trial-and-error, trial and error: Idioms

Slang (1 matching dictionary)

23. trial and error: Urban Dictionary

(Note: See trial_and_errors as well.)

Definitions from Wiktionary (trial and error) ▸ noun:  The process of finding a solution to a problem by trying many possible solutions and learning from mistakes until success is attained. Similar: empirical, heuristic, training exercise, formula, procedure, active learning, work, technique, treadmill, test, more... Opposite: methodical, systematic, planned, calculated, deliberate Phrases: by trial and error, more... Adjectives: functioning, in situ, connected, tandem, hands-on, interacting, operative, interactive, interjectional, supersessive, mediary ▸ Words similar to trial and error ▸ Usage examples for trial and error ▸ Idioms related to trial and error ▸ Wikipedia articles (New!) ▸ Words that often appear near trial and error ▸ Rhymes of trial and error ▸ Invented words related to trial and error