Definition of “booster” - English Dictionary

(Definition of “booster” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“booster” in American English

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boosternoun [ C ]

us /ˈbu·stər/

booster noun [ C ] (SUPP0RTER)

an action or thing that improves or increases something:

Winning this game was a great morale booster for the team.

A booster is also someone who is an enthusiastic supporter of something.

booster noun [ C ] (ROCKET)

the first stage of a rocket (= object sent into space) that pushes it off the ground

(Definition of “booster” from the Cambridge Academic Content Dictionary © Cambridge University Press)