: 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
Older children and adults are advised to get the vaccine as well as a booster every 10 years.
—
Emma Bowman, NPR, 21 Sep. 2024
Pregnant women are also recommended to be vaccinated against the infection, and adults are supposed to get boosters every 10 years.
—Brenda Goodman, CNN, 20 Sep. 2024
This should be a morale booster moving forward with his vision for continuing the Disney legacy with its own modern spin.
—Bill Desowitz, IndieWire, 19 Sep. 2024
For the first time, SpaceX will attempt to return the Starship rocket's Super Heavy booster back to its launch pad in South Texas on the next flight.
—Stephen Clark, Ars Technica, 18 Sep. 2024
See all Example Sentences for booster 
Emma Bowman, NPR, 21 Sep. 2024
Pregnant women are also recommended to be vaccinated against the infection, and adults are supposed to get boosters every 10 years.
—Brenda Goodman, CNN, 20 Sep. 2024
This should be a morale booster moving forward with his vision for continuing the Disney legacy with its own modern spin.
—Bill Desowitz, IndieWire, 19 Sep. 2024
For the first time, SpaceX will attempt to return the Starship rocket's Super Heavy booster back to its launch pad in South Texas on the next flight.
—Stephen Clark, Ars Technica, 18 Sep. 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 2 Oct. 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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