: 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
However, that booster was lost shortly after landing.
—
Josh Dinner, Space.com, 3 Mar. 2025
At the same time Walton was hearing Bradley’s suit, Judge Robert J. Conrad, of the Western District of North Carolina, was presiding over the criminal prosecution of Eric Leak, a North Carolina State booster who owned a financial advisory firm for pro athletes called Hot Shots Sports Management.
—Daniel Libit, Sportico.com, 3 Mar. 2025
If you are not fully vaccinated or are unsure of your status, your doctor may recommend a measles booster.
—Erica Sloan, SELF, 28 Feb. 2025
This was the debut launch of the rocket’s first-stage booster, with a recovery landing downrange on the droneship Just Read the Instructions stationed in the Atlantic.
—Richard Tribou, Orlando Sentinel, 27 Feb. 2025
See All Example Sentences for booster
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Josh Dinner, Space.com, 3 Mar. 2025
At the same time Walton was hearing Bradley’s suit, Judge Robert J. Conrad, of the Western District of North Carolina, was presiding over the criminal prosecution of Eric Leak, a North Carolina State booster who owned a financial advisory firm for pro athletes called Hot Shots Sports Management.
—Daniel Libit, Sportico.com, 3 Mar. 2025
If you are not fully vaccinated or are unsure of your status, your doctor may recommend a measles booster.
—Erica Sloan, SELF, 28 Feb. 2025
This was the debut launch of the rocket’s first-stage booster, with a recovery landing downrange on the droneship Just Read the Instructions stationed in the Atlantic.
—Richard Tribou, Orlando Sentinel, 27 Feb. 2025
See All Example Sentences for booster
Articles Related to booster
Cite this Entry
“Booster.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/booster. Accessed 13 Mar. 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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