Usually means: Additional dose enhancing vaccine effectiveness.
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We found 40 dictionaries that define the word booster:

General (20 matching dictionaries)
  1. booster: Merriam-Webster.com
  2. booster, booster: Oxford Learner's Dictionaries
  3. booster: American Heritage Dictionary of the English Language
  4. booster: Collins English Dictionary
  5. booster: Vocabulary.com
  6. Booster, booster: Wordnik
  7. booster: Cambridge Advanced Learner's Dictionary
  8. booster: Wiktionary
  9. booster: Webster's New World College Dictionary, 4th Ed.
  10. booster: The Wordsmyth English Dictionary-Thesaurus
  11. booster: Infoplease Dictionary
  12. booster: Dictionary.com
  13. booster: Cambridge Essential American English Dictionary
  14. Booster (Fabbri ride), Booster (HUSS ride), Booster (KMG ride), Booster (electric power), Booster (rocketry), Booster (sports), Booster: Wikipedia, the Free Encyclopedia
  15. booster: Rhymezone
  16. booster: Free Dictionary
  17. booster: Mnemonic Dictionary
  18. -booster, booster: Dictionary/thesaurus

Business (1 matching dictionary)
  1. Construction Term Glossary (No longer online)

Computing (2 matching dictionaries)
  1. Booster: Free On-line Dictionary of Computing
  2. -booster, booster: Encyclopedia

Medicine (7 matching dictionaries)
  1. AIDSinfo Glossary (No longer online)
  2. online medical dictionary (No longer online)
  3. Health and Wellness Dictionary (No longer online)
  4. Hepatitis C Information Central (No longer online)
  5. booster: Dictionary of Cancer Terms
  6. Glossary of HIV/AIDS Related Terms (No longer online)
  7. -booster, booster: Medical dictionary

Science (1 matching dictionary)
  1. Drug Discovery and Development (No longer online)

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

Sports (2 matching dictionaries)
  1. Booster: Bicycle Glossary
  2. 2060 Shadow-Slang (No longer online)

Tech (4 matching dictionaries)
  1. AUTOMOTIVE TERMS (No longer online)
  2. Explosives (No longer online)
  3. Schlumberger Oilfield Glossary (No longer online)
  4. PhotoNotes Dictionary of Film and Digital Photography (No longer online)

(Note: See boostering as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  Something that boosts.
noun:  The first stage of a multistage rocket that provides the thrust for liftoff and the initial flight.
noun:  A motor-generator set used for voltage regulation in direct current electrical power circuits.
noun:  Someone who is a fan or supporter of something.
noun:  Someone who promotes a town or business.
noun:  A member of a booster club.
noun:  (immunology) A booster dose.
noun:  (explosives) A small quantity of a sensitive explosive that is triggered by a detonator and provides the energy needed to detonate a larger quantity of a less-sensitive explosive.
noun:  (linguistics) A term that serves to amplify or strengthen an utterance, such as "really".
noun:  (video games) A power-up item.
noun:  (gaming) A package of cards or figurines designed to add to a player's collection.
noun:  (slang) A thief.
noun:  (rail transport) A booster engine fitted to a steam locomotive.
verb:  (transitive, medicine) To give a booster shot to; to boost.
noun:  Short for booster seat. [A small seat placed upon standard seating, particularly to enable children to eat at a table or (automotive) to allow safer use of regular seat belts.]

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