: one that boosts: such as
a
: an enthusiastic supporter
b
: an auxiliary device for increasing force, power, pressure, or effectiveness
c
slang
: shoplifter
d
: a radio-frequency amplifier for a radio or television receiving set
e
: the first stage of a multistage rocket providing thrust for the launching and the initial part of the flight
f
: a substance or dose used to renew or increase the effect of a drug or immunizing agent
especially
: booster shot
Synonyms
Examples of booster in a Sentence
These exercises are real metabolism boosters.
Music is my favorite mood booster.
A sincere compliment can be a true confidence booster.
The university has a number of wealthy boosters who contribute generously each year.
a new design for rocket boosters
Recent Examples on the Web
Customers receive two parlay boosters per day: one for a traditional parlay, and one for a single-game parlay.
—
Jordan Horrobin, Miami Herald, 3 July 2024
Firefly is moving fast to deliver the first booster stage for the Antares 330 to Northrop Grumman early next year, according to Weber.
—Stephen Clark, Ars Technica, 2 July 2024
Lakewood was far from perfect, Curwen noted, citing racial and economic strife that some boosters liked to ignore.
—Shelby Grad, Los Angeles Times, 28 June 2024
Economists have historically held equality and efficiency at odds with each other, with higher UI benefits seen as an equality booster that trades off against economic efficiency.
—Oshan Jarow, Vox, 26 June 2024
See all Example Sentences for booster 
Jordan Horrobin, Miami Herald, 3 July 2024
Firefly is moving fast to deliver the first booster stage for the Antares 330 to Northrop Grumman early next year, according to Weber.
—Stephen Clark, Ars Technica, 2 July 2024
Lakewood was far from perfect, Curwen noted, citing racial and economic strife that some boosters liked to ignore.
—Shelby Grad, Los Angeles Times, 28 June 2024
Economists have historically held equality and efficiency at odds with each other, with higher UI benefits seen as an equality booster that trades off against economic efficiency.
—Oshan Jarow, Vox, 26 June 2024
See all Example Sentences for booster
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'booster.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
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Cite this Entry
“Booster.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/booster. Accessed 7 Jul. 2024.
Copy CitationKids Definition
booster
noun
boost·er
ˈbü-stər 
1
: one that boosts
2
: an enthusiastic supporter
3
4
: a device for strengthening radio or television signals
5
: the first stage of a multistage rocket providing force for the launching and the first part of the flight
Medical Definition
booster
noun
boost·er
ˈbü-stər
: a substance or dose used to renew or increase the effect of a drug or immunizing agent: such as
a(1)
(2)
b
: synergist sense 1
a chemical acting as a booster to sulfa drugs
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