something that improves or increases something:
Thesaurus: synonyms and related words
Making things better
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an engine on a spacecraft that gives extra power for the first part of a flight:
Space travel
a small amount 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:
Medicine in different forms
an action or thing that improves or increases something:
A booster is also someone who is an enthusiastic supporter of something.
the first stage of a rocket (= object sent into space) that pushes it off the ground
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