Usually means: General guideline, not precise rule.
Definitions Related words Phrases Mentions
We found 33 dictionaries that define the word rule of thumb:

General (24 matching dictionaries)
  1. rule of thumb: Longman Dictionary of Contemporary English
  2. rule of thumb: Merriam-Webster
  3. rule of thumb: Oxford Learner's Dictionaries
  4. rule of thumb: American Heritage Dictionary of the English Language
  5. rule-of-thumb, rule-of-thumb, rule of thumb: Collins English Dictionary
  6. rule of thumb: Vocabulary.com
  7. rule of thumb: Wordnik
  8. rule of thumb: Cambridge Advanced Learner's Dictionary
  9. rule-of-thumb, rule of thumb: Wiktionary
  10. rule of thumb: The Wordsmyth English Dictionary-Thesaurus
  11. rule of thumb: Infoplease Dictionary
  12. rule of thumb: Dictionary.com
  13. Rule-of-thumb, Rule of thumb: Wikipedia, the Free Encyclopedia
  14. rule of thumb: Rhymezone
  15. Rule of Thumb: Dictionary of Phrase and Fable (1898)
  16. rule of thumb: FreeDictionary.org
  17. rule of thumb: Mnemonic Dictionary
  18. Rule of Thumb: The Word Detective
  19. RULE OF THUMB: Ye Olde English Sayings
  20. rule of thumb: TheFreeDictionary.com
  21. Rule of thumb: World Wide Words
  22. Rule of thumb: Phrase Finder

Business (4 matching dictionaries)
  1. RULE OF THUMB: Accounting Glossary
  2. Construction Term Glossary (No longer online)
  3. Accounting, Business Studies and Economics Dictionary (No longer online)
  4. BusinessDictionary.com (No longer online)

Computing (1 matching dictionary)
  1. rule of thumb: Encyclopedia

Miscellaneous (2 matching dictionaries)
  1. Political (No longer online)
  2. rule of thumb: Idioms

Slang (1 matching dictionary)
  1. rule of thumb: Urban Dictionary

Tech (1 matching dictionary)
  1. Glossary of Meteorology (No longer online)

(Note: See rule_of_thumbs as well.)

Definitions from Wiktionary (rule of thumb)

noun:  A general guideline, rather than a strict rule; an approximate measure or means of reckoning based on experience or common knowledge.
noun:  (attributive, usually hyphenated) Approximated, guesstimated.

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