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  1. Oxford Dictionary

    booster

    • IPA[ˈbuːstə]

    英式

    • n.
      a device for increasing electrical voltage or signal strength.；the first stage of a rocket or spacecraft, used to give initial acceleration and then jettisoned.

    • noun: booster, plural noun: boosters

    • 釋義

    名詞

    • 1. a device for increasing electrical voltage or signal strength.
    • 2. the first stage of a rocket or spacecraft, used to give initial acceleration and then jettisoned.
    • 3. a dose of a vaccine that increases or renews the effect of an earlier one boosters at five-year intervals are recommended a booster injection
    • 4. a source of help or encouragement job fairs are a great morale booster
    • ▪ North American a keen promoter of a person, organization, or cause.
    • 5. North American informal a shoplifter.