: 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
An early Monday morning launch was the first of two on the Space Coast with planned booster landings that could bring sonic booms to Central Florida.
—
Richard Tribou, The Orlando Sentinel, 21 Apr. 2025
Not all wounds will require a tetanus booster; a physician will take into account how severe the wound is, your age and the last time you were vaccinated, says Harris.
—Caroline C. Boyle, USA Today, 20 Apr. 2025
The brake master cylinder may allow brake fluid to leak from the front wheel circuit into the brake booster.
—Thomas G. Moukawsher, MSNBC Newsweek, 17 Apr. 2025
The rocket's conical stage adapter, which connects the SLS core booster to the launch vehicle's upper stages, was added to the stack on Saturday (April 12), according to NASA.
—Josh Dinner, Space.com, 16 Apr. 2025
See All Example Sentences for booster
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Richard Tribou, The Orlando Sentinel, 21 Apr. 2025
Not all wounds will require a tetanus booster; a physician will take into account how severe the wound is, your age and the last time you were vaccinated, says Harris.
—Caroline C. Boyle, USA Today, 20 Apr. 2025
The brake master cylinder may allow brake fluid to leak from the front wheel circuit into the brake booster.
—Thomas G. Moukawsher, MSNBC Newsweek, 17 Apr. 2025
The rocket's conical stage adapter, which connects the SLS core booster to the launch vehicle's upper stages, was added to the stack on Saturday (April 12), according to NASA.
—Josh Dinner, Space.com, 16 Apr. 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 30 Apr. 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
Love words? Need even more definitions?
Merriam-Webster unabridged
Share