: 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
Consider taking a winter storm kit along with you, including such items as tire chains, booster cables, flashlight, shovel, blankets, and extra clothing.
—
Amanda Greenwood, MSNBC Newsweek, 11 Dec. 2025
Citizens will also install 53 miles of water mains, hence the letters sent to property owners northwest of Indianapolis, adding four new boosters and seven new storage tanks.
—Sophie Hartley, IndyStar, 10 Dec. 2025
Once the fairing is incorporated with Neutron's first stage, Rocket Lab will perform a series of prelaunch tests, including a static hotfire of the nine Archimedes engines that power the reusable booster.
—Josh Dinner, Space.com, 10 Dec. 2025
The Broncos only won one of their three games in Maui, losing a pair of potential resume boosters against USC and NC State.
—Shaun Goodwin, Idaho Statesman, 10 Dec. 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.
Amanda Greenwood, MSNBC Newsweek, 11 Dec. 2025
Citizens will also install 53 miles of water mains, hence the letters sent to property owners northwest of Indianapolis, adding four new boosters and seven new storage tanks.
—Sophie Hartley, IndyStar, 10 Dec. 2025
Once the fairing is incorporated with Neutron's first stage, Rocket Lab will perform a series of prelaunch tests, including a static hotfire of the nine Archimedes engines that power the reusable booster.
—Josh Dinner, Space.com, 10 Dec. 2025
The Broncos only won one of their three games in Maui, losing a pair of potential resume boosters against USC and NC State.
—Shaun Goodwin, Idaho Statesman, 10 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 13 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
Love words? Need even more definitions?
Merriam-Webster unabridged
Share