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Definitions

booster

[boo-ster] / ˈbu stər /
NOUN
supporter
Synonyms
Antonyms


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Those include a redesigned propellant system on its booster and improved Raptor engines.

From The Wall Street Journal • Apr. 4, 2026

For older children or adults, a MenB vaccine or booster costs about £220 privately.

From BBC • Apr. 3, 2026

Generally, it takes a couple of weeks to get the fullest protection from a vaccine and some require booster doses.

From BBC • Mar. 17, 2026

Using a standard booster approach in mice, both vaccine types produced similar antiviral T cell and antibody-producing B cell responses.

From Science Daily • Mar. 17, 2026

"That vacuum cleaner sounds like a rocket booster!"

From "Scream for Ice Cream: Nancy Drew and the Clue Crew, #2" by Carolyn Keene