: 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
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
According to Plunge, cold-water exposure can trigger dopamine release up to 500 times above normal levels, acting as a powerful mood booster.
—
Samantha Agate, Charlotte Observer, 30 Apr. 2026
Quattro is the company’s nickname for a more powerful upper stage for the New Glenn rocket, which will feature four BE-3U engines instead of the two currently powering the booster.
—Eric Berger, ArsTechnica, 30 Apr. 2026
The massive rocket produces nearly 17 million pounds of thrust on liftoff, and produces or more potent sonic boom when its booster returns to the launch site.
—Richard Tribou, The Orlando Sentinel, 29 Apr. 2026
Orange boosters have raised about $4,000, Poitra said.
—Dan Albano, Oc Register, 21 Apr. 2026
See All Example Sentences for booster
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Samantha Agate, Charlotte Observer, 30 Apr. 2026
Quattro is the company’s nickname for a more powerful upper stage for the New Glenn rocket, which will feature four BE-3U engines instead of the two currently powering the booster.
—Eric Berger, ArsTechnica, 30 Apr. 2026
The massive rocket produces nearly 17 million pounds of thrust on liftoff, and produces or more potent sonic boom when its booster returns to the launch site.
—Richard Tribou, The Orlando Sentinel, 29 Apr. 2026
Orange boosters have raised about $4,000, Poitra said.
—Dan Albano, Oc Register, 21 Apr. 2026
See All Example Sentences for booster
Cite this Entry
“Booster.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/booster. Accessed 1 May. 2026.
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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