: 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
Decades of research show that new sports stadium projects seldom provide the economic windfall that boosters and lawmakers promise.
—
Matthew Kelly, Kansas City Star, 25 Dec. 2025
While scramjets require a boost from rockets or jet engines to reach operating speed, the AFRL design imagines a sleigh that accelerates to hypersonic speed, sheds its boosters, and cruises efficiently across continents without destroying its crew.
—Kapil Kajal, Interesting Engineering, 25 Dec. 2025
Value boosters like electric vehicle charging stations, energy-efficient appliances, and zero-energy-ready dwellings will continue to surge in popularity throughout the next year as buyers seek out ways to save time and money in their new homes.
—Sophia Beams, Better Homes & Gardens, 23 Dec. 2025
During that first flight, the rocket’s booster missed the key goal of landing on a barge in the Atlantic Ocean for future reuse.
—Meghan Bartels, Scientific American, 22 Dec. 2025
See All Example Sentences for booster
Examples are automatically compiled from online sources to
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Matthew Kelly, Kansas City Star, 25 Dec. 2025
While scramjets require a boost from rockets or jet engines to reach operating speed, the AFRL design imagines a sleigh that accelerates to hypersonic speed, sheds its boosters, and cruises efficiently across continents without destroying its crew.
—Kapil Kajal, Interesting Engineering, 25 Dec. 2025
Value boosters like electric vehicle charging stations, energy-efficient appliances, and zero-energy-ready dwellings will continue to surge in popularity throughout the next year as buyers seek out ways to save time and money in their new homes.
—Sophia Beams, Better Homes & Gardens, 23 Dec. 2025
During that first flight, the rocket’s booster missed the key goal of landing on a barge in the Atlantic Ocean for future reuse.
—Meghan Bartels, Scientific American, 22 Dec. 2025
See All Example Sentences for booster
Cite this Entry
“Booster.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/booster. Accessed 26 Dec. 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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