Usually means: Increase or enhance performance or energy.
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We found 40 dictionaries that define the word boost:

General (25 matching dictionaries)
  1. boost: Merriam-Webster.com
  2. boost: Oxford Learner's Dictionaries
  3. boost: American Heritage Dictionary of the English Language
  4. boost: Collins English Dictionary
  5. boost: Vocabulary.com
  6. Boost, boost: Wordnik
  7. boost: Cambridge Advanced Learner's Dictionary
  8. boost: Wiktionary
  9. boost: Webster's New World College Dictionary, 4th Ed.
  10. boost: The Wordsmyth English Dictionary-Thesaurus
  11. boost: Infoplease Dictionary
  12. boost: Dictionary.com
  13. boost: Online Etymology Dictionary
  14. boost: Cambridge Essential American English Dictionary
  15. Boost (chocolate bar), Boost (drink), Boost (film), Boost (material), Boost, The Boost: Wikipedia, the Free Encyclopedia
  16. Boost: Online Plain Text English Dictionary
  17. boost: Webster's Revised Unabridged, 1913 Edition
  18. boost: Rhymezone
  19. boost: AllWords.com Multi-Lingual Dictionary
  20. boost: Webster's 1828 Dictionary
  21. boost: Free Dictionary
  22. boost: Mnemonic Dictionary
  23. boost: Dictionary/thesaurus

Business (1 matching dictionary)
  1. boost: Legal dictionary

Computing (1 matching dictionary)
  1. boost: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Miscellaneous (3 matching dictionaries)
  1. BOOST: Acronym Finder
  2. AbbreviationZ (No longer online)
  3. boost: Idioms

Science (1 matching dictionary)
  1. Boost: Eric Weisstein's World of Physics

Slang (3 matching dictionaries)
  1. boost, boost, boost, boost, boost, boost, boost: Green’s Dictionary of Slang
  2. Boost: Street Terms: Drugs and the Drug Trade
  3. The boost, boost: Urban Dictionary

Sports (2 matching dictionaries)
  1. Hickok Sports Glossaries (No longer online)
  2. Snowboarding Glossary (No longer online)

Tech (3 matching dictionaries)
  1. AUTOMOTIVE TERMS (No longer online)
  2. Glossary of video terms (No longer online)
  3. Sweetwater Music (No longer online)

(Note: See boosted as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  A push from behind, as to one who is endeavoring to climb.
noun:  Something that helps, or adds power or effectiveness; assistance.
noun:  (physics) A coordinate transformation that changes velocity.
noun:  (automotive engineering) A positive intake manifold pressure in cars with turbochargers or superchargers.
verb:  (transitive) To lift or push from behind (one who is endeavoring to climb); to push up.
verb:  (transitive, by extension) To help or encourage (something) to increase or improve; to assist in overcoming obstacles.
verb:  (slang, transitive) To steal.
verb:  (Canada, transitive) To jump-start a vehicle by using cables to connect the battery in a running vehicle to the battery in a vehicle that won't start.
verb:  (transitive, medicine) To give a booster shot to.
verb:  (transitive, engineering) To amplify; to signal boost.

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