: 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
Final Four runs because of an NCAA violations scandal involving booster Ed Martin.
—
Joseph Buczek, CBS News, 19 Mar. 2026
The booster pump equipment is being stored and operated near 6550 Soledad Mountain Road.
—Ashley MacKin Solomon, San Diego Union-Tribune, 18 Mar. 2026
Peptide-boosters might rush to point out the positive findings of previous studies, which is fair enough.
—Joe Wilkins Published Mar 18, Futurism, 18 Mar. 2026
To his credit, though, on the album, Harlow—along with Norwegian producer Aksel Arvid, known for his work with PinkPantheress—flexes the checkbook like a SEC football booster to recruit a team of jazz and R&B pros.
—Alphonse Pierre, Pitchfork, 17 Mar. 2026
See All Example Sentences for booster
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show current usage.
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Joseph Buczek, CBS News, 19 Mar. 2026
The booster pump equipment is being stored and operated near 6550 Soledad Mountain Road.
—Ashley MacKin Solomon, San Diego Union-Tribune, 18 Mar. 2026
Peptide-boosters might rush to point out the positive findings of previous studies, which is fair enough.
—Joe Wilkins Published Mar 18, Futurism, 18 Mar. 2026
To his credit, though, on the album, Harlow—along with Norwegian producer Aksel Arvid, known for his work with PinkPantheress—flexes the checkbook like a SEC football booster to recruit a team of jazz and R&B pros.
—Alphonse Pierre, Pitchfork, 17 Mar. 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 24 Mar. 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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