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ENGLISH · A WORD WITH POSSIBILITIES

booster.

Something that boosts.

7 characters2 syllables approx.English language

Meaning & usage

noun/ˈbustɚ/General-American

  1. Something that boosts.

  2. Ellipsis of booster seat.

    abbreviation · alt-of · ellipsis

  3. The first stage of a multistage rocket, providing primary or supplemental thrust for liftoff and early flight.

  4. A 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.

  6. A member of a booster club.

  7. A booster dose.

    When did you get your last tetanus booster?

  8. 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. A term that serves to amplify or strengthen an utterance, such as "really".

  10. A power-up item.

  11. A package of cards or figurines designed to add to a player's collection.

  12. A thief.

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

  13. A booster engine fitted to a steam locomotive.

Where this word comes from

Etymology tree English boost Proto-Indo-European *-yósder. Proto-Italic *-āzios Latin -āriusnom. Latin -āriusbor. Proto-Germanic *-ārijaz Proto-West Germanic *-ārī Old English -ere Middle English -ere English -er English booster From boost + -er.

verb/ˈbustɚ/General-American

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

    transitive
Where this word comes from

Etymology tree English boost Proto-Indo-European *-yósder. Proto-Italic *-āzios Latin -āriusnom. Latin -āriusbor. Proto-Germanic *-ārijaz Proto-West Germanic *-ārī Old English -ere Middle English -ere English -er English booster From boost + -er.

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.