: 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
The first-stage booster made its ninth flight landing on the droneship A Shortfall of Gravitas, marking its 100th booster catch.
—
Richard Tribou, Orlando Sentinel, 15 Mar. 2025
There was also a successful touchdown on this morning's Starlink launch, the 18th to date for this particular Falcon 9 booster, according to a SpaceX mission description.
—Mike Wall, Space.com, 15 Mar. 2025
These days, many people are hesitant to continue to get COVID vaccines and boosters.
—Wendy Wisner, Parents, 14 Mar. 2025
The nozzle fell off the bottom of one of the Vulcan launcher's twin solid rocket boosters about a half-minute into its second test flight last year.
—Stephen Clark, Ars Technica, 14 Mar. 2025
See All Example Sentences for booster
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Richard Tribou, Orlando Sentinel, 15 Mar. 2025
There was also a successful touchdown on this morning's Starlink launch, the 18th to date for this particular Falcon 9 booster, according to a SpaceX mission description.
—Mike Wall, Space.com, 15 Mar. 2025
These days, many people are hesitant to continue to get COVID vaccines and boosters.
—Wendy Wisner, Parents, 14 Mar. 2025
The nozzle fell off the bottom of one of the Vulcan launcher's twin solid rocket boosters about a half-minute into its second test flight last year.
—Stephen Clark, Ars Technica, 14 Mar. 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 21 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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