Usually means: Rate of movement over time.
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We found 70 dictionaries that define the word speed:

General (31 matching dictionaries)
  1. speed: Longman Dictionary of Contemporary English
  2. speed: Merriam-Webster
  3. speed, speed: Oxford Learner's Dictionaries
  4. speed: American Heritage Dictionary of the English Language
  5. speed: Collins English Dictionary
  6. speed: Vocabulary.com
  7. Speed, speed: Wordnik
  8. speed: Cambridge Advanced Learner's Dictionary
  9. Speed, speed: Wiktionary
  10. speed: Webster's New World College Dictionary, 4th Ed.
  11. speed: The Wordsmyth English Dictionary-Thesaurus
  12. speed: Infoplease Dictionary
  13. speed: Dictionary.com
  14. speed (n.), speed (v.): Online Etymology Dictionary
  15. SPEED (TV channel), SPEED, Speed (American cable network), Speed (Australian TV network), Speed (Billy Idol song), Speed (Hindi film), Speed (Japanese band), Speed (Japanese group), Speed (Marvel Comics), Speed (Montgomery Gentry song), Speed (Oakwood), Speed (South Korean band), Speed (TV channel), Speed (TV network), Speed (TV series), Speed (band), Speed (card game), Speed (comics), Speed (disambiguation), Speed (drug), Speed (film), Speed (movie), Speed (novel), Speed (ride), Speed (roller coaster), Speed (serial), Speed, The Speed: Wikipedia, the Free Encyclopedia
  16. Speed: Online Plain Text English Dictionary
  17. speed: Webster's Revised Unabridged, 1913 Edition
  18. speed: Rhymezone
  19. speed: AllWords.com Multi-Lingual Dictionary
  20. speed: Webster's 1828 Dictionary
  21. Speed: E Cobham Brewer, The Reader's Handbook
  22. SPEED: Stammtisch Beau Fleuve Acronyms
  23. Speed: Dictionary of Phrase and Fable (1898)
  24. speed: FreeDictionary.org
  25. speed: The Phrontistery - A Dictionary of Obscure Words
  26. speed: Mnemonic Dictionary
  27. speed: TheFreeDictionary.com
  28. speed: Wikimedia Commons US English Pronunciations
  29. speed: Cambridge Essential American English Dictionary

Art (2 matching dictionaries)
  1. Shakespeare Glossary (No longer online)
  2. Movie Terminology Glossary (No longer online)

Business (6 matching dictionaries)
  1. MoneyGlossary.com (No longer online)
  2. Speed: Bloomberg Financial Glossary
  3. Speed: Harvey Financial
  4. speed: Legal dictionary
  5. Speed: Financial dictionary
  6. Speed: WashingtonPost.com: Business

Computing (3 matching dictionaries)
  1. SPEED: Free On-line Dictionary of Computing
  2. speed: Netlingo
  3. Speed (drug), speed: Encyclopedia

Medicine (6 matching dictionaries)
  1. speed: Merriam-Webster Medical Dictionary
  2. Speed: MedTerms.com Medical Dictionary
  3. Speed (methamphetamine): Merck Manuals
  4. online medical dictionary (No longer online)
  5. Speed (drug), speed: Medical dictionary
  6. Speed: Drug Medical Dictionary

Miscellaneous (5 matching dictionaries)
  1. Navajo Code Talkers' Dictionary (No longer online)
  2. baby names list (No longer online)
  3. SPEED: Acronym Finder
  4. AbbreviationZ (No longer online)
  5. speed: Idioms

Science (3 matching dictionaries)
  1. Speed: Eric Weisstein's World of Mathematics
  2. Speed: Eric Weisstein's World of Physics
  3. SPEED: Zoom Astronomy Glossary

Slang (3 matching dictionaries)
  1. speed, speed: Green’s Dictionary of Slang
  2. speed: English slang and colloquialisms used in the United Kingdom
  3. Speed: Street Terms: Drugs and the Drug Trade

Sports (3 matching dictionaries)
  1. Speed: Dan's Poker
  2. Speed: Card Games
  3. Speed: Sports Definitions

Tech (8 matching dictionaries)
  1. AUTOMOTIVE TERMS (No longer online)
  2. Glossary of video terms (No longer online)
  3. Speed: Nikonians Photo Glossary
  4. Lake and Water Word Glossary (No longer online)
  5. Dictionary for Avionics (No longer online)
  6. PhotoNotes Dictionary of Film and Digital Photography (No longer online)
  7. Reliance Electric motor terms (No longer online)
  8. SeaTalk Dictionary of English Nautical Language (No longer online)

(Note: See sped as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  The state of moving quickly or the capacity for rapid motion.
noun:  (mathematics, physics) The rate of motion or action, specifically the magnitude of the velocity; the rate distance is traversed in a given time.
noun:  (photography) The sensitivity to light of film, plates or sensor.
noun:  (photography) The duration of exposure, the time during which a camera shutter is open (shutter speed).
noun:  (photography) The largest size of the lens opening at which a lens can be used.
noun:  (photography) The ratio of the focal length to the diameter of a photographic objective.
noun:  (slang, uncountable) Amphetamine or any amphetamine-based drug (especially methamphetamine) used as a stimulant, especially illegally.
noun:  (archaic) Luck, success, prosperity.
noun:  (slang) Personal preference.
noun:  (finance, uncountable) A third-order measure of derivative price sensitivity, expressed as the rate of change of gamma with respect to changes in the underlying asset price.
verb:  (intransitive, archaic) To succeed; to prosper, be lucky.
verb:  (transitive, archaic) To help someone, to give them fortune; to aid or favour.
verb:  (intransitive) To go fast.
verb:  (intransitive) To exceed the speed limit.
verb:  (transitive) To increase the rate at which something occurs.
verb:  (intransitive, slang) To be under the influence of stimulant drugs, especially amphetamines.
verb:  (obsolete) To be expedient.
verb:  (archaic) To hurry to destruction; to put an end to; to ruin.
verb:  (archaic) To wish success or good fortune to, in any undertaking, especially in setting out upon a journey.
verb:  To cause to make haste; to dispatch with celerity; to drive at full speed; hence, to hasten; to hurry.
verb:  To hasten to a conclusion; to expedite.
noun:  A surname transferred from the nickname.

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