booster

B3O1O1S1T1E1R1
US/ˈbustɚ/

noun

Something that boosts.

CommonScrabble 9

Meanings

nounbooster (plural boosters)

plural boosters

  1. Something that boosts.
    1 more example

    DUBNER: Now, the Children's Hospital of Philadelphia, some officials there, after we published these findings in the New York Times, wrote a letter to the editor, and it said, "Our research consistently shows that child safety seats and booster seats significantly lower the risk of serious injury compared to seatbelts alone." They go on to say that your recommendations to rethink car-seat laws are "irresponsible and dangerous"... LEVITT: I think what's irresponsible and dangerous is accepting mediocrity, accepting our existing solutions as if they are the best solution. What I take away from the research is we've put in all of these laws about child car seats and we've built these contraptions but then when you look at the data, they're really not doing better, certainly not much better, than this other invention, which never had kids in mind and shouldn't work at all.

    2021 January 13, Stephen Joseph Dubner, “How Much Do We Really Care about Children?”, in Freakonomics Radio, Episode 447
  2. abbreviationellipsisEllipsis of booster seat.
  3. spacecraftaerospaceThe first stage of a multistage rocket, providing primary or supplemental thrust for liftoff and early flight.
  4. businessA motor-generator set used for voltage regulation in direct current electrical power circuits.
  5. Someone who publicly promotes or endorses (something or someone); a fan or supporter.

    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.

    2012, “Lexington: A fiscal hawk, grounded”, in The Economist
    1 more example

    The Pied Piper treats Lowenstein as a metaphor for American post-war liberalism and subjects a once highly regarded political movement to the same scrutiny Lowenstein himself faces. Not too surprisingly, both come out wanting, though their boosters claim otherwise.

    1985 August 24, Gordon Gottlieb, “CIA-Baiting a Liberal Closet Queen”, in Gay Community News, volume 13, number 7, page 12
  6. immunologyA booster dose.

    When did you get your last tetanus booster?

    1 more example

    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.

    2021 October 11, Jan Hoffman, “Boosters Are Complicating Efforts to Persuade the Unvaccinated to Get Shots”, in The New York Times, →ISSN
  7. explosivesA 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.
  8. human sciencesA term that serves to amplify or strengthen an utterance, such as "really".
  9. video gamesA power-up item.
  10. gamesA package of cards or figurines designed to add to a player's collection.
  11. slangA thief.

    The security guard captured two boosters before they could exit the retail store.

  12. rail transportA booster engine fitted to a steam locomotive.

    Also in 1939, six 4-8-4s, classified "Kb" because they have boosters, were built at Hillside for service between Christchurch and Arthurs Pass.

    1954 August, J. B. Snell, “The New Zealand Government Railways—2”, in Railway Magazine, page 561
    1 more example

    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.

    1941 January, “Recent North American Locomotives”, in Railway Magazine, page 27
verbbooster (third-person singular simple present boosters, present participle boostering, simple past and past participle boostered)

present singular third person boosters · participle present boostering · participle past boostered · past boostered

  1. transitivemedicineTo give a booster shot to; to boost.

    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.

    2022 January 11, Jessica Jacob, “Health Workers, ‘Risking Their Own Lives to Save Ours’”, in The New York Times
    1 more example

    "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 3, Joelle Goldstein, “Jimmy Fallon Reveals He Tested Positive for COVID: 'I Was Vaccinated and Boostered'”, in People

Synonyms & antonyms

nouna person who backs a politician or a team etc.

nounsomeone who is an active supporter and advocate

nouna thief who steals goods that are in a store

nounan amplifier for restoring the strength of a transmitted signal

Similar
booster amplifierbooster stationrelay linkrelay stationrelay transmitter
Broader

nounthe first stage of a multistage rocket

Similar
booster rocketbooster unittakeoff boostertakeoff rocket

nounan additional dose that makes sure the first dose was effective

Similar
Broader

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

Translations

Bulgarian усилвател, привърженик
  • усилвател (usilvatel)Something that boosts
  • привърженик (privărženik)Someone who is a fan or supporter of something
Catalan accelerador
  • acceleradorThe first stage of a multistage rocket
Chinese Mandarin 助推器
  • 助推器 (zhùtuīqì)The first stage of a multistage rocket
Dutch draagraket
  • draagraketThe first stage of a multistage rocket
Esperanto vigliĝilo, akcela raketo
  • vigliĝiloSomething that boosts
  • akcela raketoThe first stage of a multistage rocket
Finnish kasvattaja, kohottaja
  • kasvattajaSomething that boosts
  • kohottajaSomething that boosts
  • kantorakettiThe first stage of a multistage rocket
  • kannattajaSomeone who is a fan or supporter of something
French lanceur
  • lanceurThe first stage of a multistage rocket
German Unterstützung, Booster
  • UnterstützungSomething that boosts
  • BoosterThe first stage of a multistage rocket
  • UnterstützerSomeone who is a fan or supporter of something
Greek ενίσχυση
  • ενίσχυση (eníschysi)Something that boosts
Japanese ブースター
  • ブースター (būsutā)The first stage of a multistage rocket
Polish rakietowy silnik
  • rakietowy silnikThe first stage of a multistage rocket
Portuguese foguete reforçador, foguete auxiliar
  • foguete reforçadorThe first stage of a multistage rocket
  • foguete auxiliarThe first stage of a multistage rocket
Russian усили́тель, раке́та-носи́тель
  • усили́тель (usilítelʹ)Something that boosts
  • раке́та-носи́тель (rakéta-nosítelʹ)The first stage of a multistage rocket
  • приве́рженец (privérženec)Someone who is a fan or supporter of something
Spanish refuerzo, potenciador
  • refuerzoSomething that boosts
  • potenciadorSomething that boosts
  • bústerSomething that boosts
  • servofrenoSomething that boosts
  • adyuvanteSomething that boosts
  • propulsorThe first stage of a multistage rocket
  • aficionadoSomeone who is a fan or supporter of something
  • seguidorSomeone who is a fan or supporter of something
Welsh roced hwbio
  • roced hwbioThe first stage of a multistage rocket

Rhymes & wordplay

Anagrams

Cite this entry
APA

booster. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/booster

MLA

“booster.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/booster. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “booster,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/booster.

Source: booster on Wiktionary, CC BY-SA 4.0.