booster Meaning in the Cambridge English Dictionary
Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

Meaning of “booster” in the English Dictionary

"booster" in British English

See all translations

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 Learner’s Dictionary & Thesaurus © Cambridge University Press)

"booster" in American English

See all translations

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)
What is the pronunciation of booster?
Add Cambridge dictionaries to your browser to your website
Word of the Day

harvest

to pick and collect crops, or to collect plants, animals, or fish to eat

Word of the Day

In London but at the station: prepositions for talking about travel
In London but at the station: prepositions for talking about travel
by Liz Walter,
September 02, 2015
Several readers have asked for information on prepositions, so I will start with a blog post that looks at an area where they are really important: travel. The first thing to remember is that we use to (and not ‘in’) after the verb go: We are going to London. I went to

Read More 

parklet noun
parklet noun
August 31, 2015
a public outdoor space that may be associated with a local business but where anyone can sit Pop-up cafes in NY are what’s actually called parklets in many other places around the country.

Read More