We found 32 dictionaries that define the word testing:

General (20 matching dictionaries)

1. testing: Longman Dictionary of Contemporary English
2. testing: Merriam-Webster
3. testing: Collins English Dictionary
4. testing: Vocabulary.com
5. Testing, testing: Wordnik
6. testing: Cambridge Advanced Learner's Dictionary
7. testing: Wiktionary
8. testing: Dictionary.com
9. testing: Cambridge Essential American English Dictionary
10. Testing (album), Testing, The Testing (Dynasty): Wikipedia, the Free Encyclopedia
11. Testing: Online Plain Text English Dictionary
12. testing: Webster's Revised Unabridged, 1913 Edition
13. testing: Rhymezone
14. Testing: AllWords.com Multi-Lingual Dictionary
15. testing: Webster's 1828 Dictionary
16. testing: FreeDictionary.org
17. testing: Mnemonic Dictionary
18. testing: TheFreeDictionary.com

Business (3 matching dictionaries)

19. testing: Legal dictionary
20. testing: Financial dictionary
21. BusinessDictionary.com (No longer online)

Computing (2 matching dictionaries)

22. testing: Free On-line Dictionary of Computing
23. Testing (Debian), testing: Encyclopedia

Medicine (4 matching dictionaries)

24. testing: Merriam-Webster Medical Dictionary
25. Dorland's Illustrated Medical Dictionary (No longer online)
26. online medical dictionary (No longer online)
27. testing: Medical dictionary

Miscellaneous (1 matching dictionary)

28. testing: Idioms

Slang (1 matching dictionary)

29. testing: Urban Dictionary

Tech (1 matching dictionary)

30. AUTOMOTIVE TERMS (No longer online)

(Note: See test as well.)

Definitions from Wiktionary ( ) ▸ adjective:  Difficult; tough. ▸ noun:  The act of conducting a test; trialing, proving. Similar: examination, retest, tester, evaluate, monitoring, pretest, tweaking, validation, experimenting, more... Opposite: ignoring, neglecting, overlooking, disregarding, skipping Types: unit testing, integration testing, system testing, acceptance testing, regression testing, performance testing, usability testing, security testing, more... Phrases: hypothesis testing, drug testing, Psychological testing, Genetic testing, nuclear testing, more... Adjectives: psychological, genetic, further, nuclear, diagnostic, extensive, empirical, clinical, routine, additional, standardized Colors:     blue,     green,     red,     yellow,     orange, more... ▸ Words similar to testing ▸ Usage examples for testing ▸ Idioms related to testing ▸ Wikipedia articles (New!) ▸ Popular adjectives describing testing ▸ Popular nouns described by testing ▸ Words that often appear near testing ▸ Rhymes of testing ▸ Invented words related to testing