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boost +‎ -er



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booster (plural boosters)

  1. Something that boosts.
  2. The first stage of a multistage rocket that provides the thrust for liftoff and the initial flight.
  3. A motor-generator set used for voltage regulation in direct current electrical power circuits.
  4. Someone who is a fan or supporter of something.
    • 2012, The Economist, Lexington: A fiscal hawk, grounded
      Nor is his district quite the Democratic bastion boosters describe: voters there narrowly backed Barack Obama in 2008, but voted for Mr Bush by a hefty margin in 2004.
  5. Someone who promotes a town or business.
  6. A member of a booster club.
  7. (immunology) A booster dose.
    When did you get your last tetanus booster?
    • 2021 October 11, Jan Hoffman, “Boosters Are Complicating Efforts to Persuade the Unvaccinated to Get Shots”, in The New York Times[1], ISSN 0362-4331:
      In the September vaccine monitor survey from the Kaiser Family Foundation, 71 percent of unvaccinated respondents said the need for boosters indicated that the vaccines were not working.
  8. (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.
  9. (linguistics) A term that serves to amplify or strengthen an utterance, such as "really".
  10. (video games) A power-up item.
  11. (gaming) A package of cards or figurines designed to add to a player's collection.
  12. (slang) A thief.
    The security guard captured two boosters before they could exit the retail store.
  13. (rail transport) A booster engine fitted to a steam locomotive.
    • 1941 January, “Recent North American Locomotives”, in Railway Magazine, page 27:
      Another notable new series of locomotives, now in course of delivery to the Canadian National Railways, [...]. Fifteen are being built by the Montreal Locomotive Works Limited, and ten by the Canadian Locomotive Company, of Kingston, Ontario; the former are being provided with boosters and the latter are not.

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booster (third-person singular simple present boosters, present participle boostering, simple past and past participle boostered)

  1. (transitive, medicine) To give a booster shot to; to boost.
    • 2022 January 3, Joelle Goldstein, “Jimmy Fallon Reveals He Tested Positive for COVID: 'I Was Vaccinated and Boostered'”, in People[2]:
      "Hey guys, on the first day of our holiday break I tested positive for Covid. I was vaccinated and boostered which made me lucky enough to only have mild symptoms," he wrote beside a photo that showed him sitting alone inside a testing room wearing a mask.
    • 2022 January 11, Jessica Jacob, “Health Workers, ‘Risking Their Own Lives to Save Ours’”, in The New York Times[3]:
      What I would prefer over hazard pay would be for every one of our patients to get vaccinated and boostered, as we request constantly. That would be what would make me happy.




Borrowed from English booster.


  • IPA(key): /ˈbu(ː)s.tər/
  • Hyphenation: boos‧ter
  • Rhymes: -ustər


booster m (plural boosters, diminutive boostertje n)

  1. A boost (something that boosts).

Derived terms[edit]

Related terms[edit]



booster m (plural boosters)

  1. booster