: 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
But the hearing served an educational purpose, just probably not the one that Revenue Subcommittee Chairman and hemp-industry booster William Hall, 6th, had in mind.
—
The Editorial Board, Chicago Tribune, 3 Feb. 2025
Trump's executive orders send a message During his first term, Trump was a coal industry booster.
—Jeff Brady, NPR, 1 Feb. 2025
Then, SpaceX will likely test-fire the booster and ship before stacking the two elements together to complete assembly of the 404-foot-tall (123.1-meter) rocket.
—Stephen Clark, Ars Technica, 1 Feb. 2025
As urban boosters and capitalists increasingly invested in industrialization, cities expanded and concentrated flammable commodities together in previously unprecedented ways.
—Justin Hawkins / Made By History, TIME, 31 Jan. 2025
See all Example Sentences for booster 
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The Editorial Board, Chicago Tribune, 3 Feb. 2025
Trump's executive orders send a message During his first term, Trump was a coal industry booster.
—Jeff Brady, NPR, 1 Feb. 2025
Then, SpaceX will likely test-fire the booster and ship before stacking the two elements together to complete assembly of the 404-foot-tall (123.1-meter) rocket.
—Stephen Clark, Ars Technica, 1 Feb. 2025
As urban boosters and capitalists increasingly invested in industrialization, cities expanded and concentrated flammable commodities together in previously unprecedented ways.
—Justin Hawkins / Made By History, TIME, 31 Jan. 2025
See all Example Sentences for booster
Articles Related to booster
Dictionary Entries Near booster
Cite this Entry
“Booster.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/booster. Accessed 16 Feb. 2025.
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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