booster Definition in the Cambridge English Dictionary
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Definition of “booster” - English Dictionary

Definition of "booster" - American English Dictionary

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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 ​greatmorale booster for the ​team. A booster is also someone who is an ​enthusiasticsupporter of something.

booster noun [C] (ROCKET)

the first ​stage of a rocket (= ​objectsent into ​space) that ​pushes it off the ​ground
(Definition of booster from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "booster" - British English Dictionary

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boosternoun [C]

uk   /ˈbuː.stər/  us   /-stɚ/

booster noun [C] (IMPROVEMENT)

something that ​improves or ​increases something: a confidence/​morale booster

booster noun [C] (ENGINE)

an ​engine on a ​spacecraft that gives ​extrapower for the first ​part of a ​flight: a ​rocket booster

booster noun [C] (DRUG)

a ​smallamount of a ​substance that is given to ​increase the ​effect of the same ​substance given some ​time before, to ​continue to ​protect a ​person from ​illness: a ​polio booster
(Definition of booster from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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