: 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
Handling booster disputes This sort of altercation was common at colleges when athletic departments started tying donations to seat locations of season ticket packages.
—
Fort Worth Star-Telegram, 30 Oct. 2025
In the case of athletics, that funding often comes from sponsors, boosters, ticket sales and media revenue.
—William Melhado, Sacbee.com, 29 Oct. 2025
With Florida, Penn State and LSU looking for a new leader, Kiffin's resume with the Rebels looks like a no-brainer for any athletic director in need of a splashy hire to soothe itchy boosters.
—Jordan Sigler, MSNBC Newsweek, 29 Oct. 2025
The Bermuda Blue Citrus was available in unique cleaning, laundry, and air-freshening items, including a fragrance booster, laundry detergent sheets, fabric softener dryer sheets, an essential oil refill, and a solid air freshener gel.
—Rebecca Jones, Southern Living, 28 Oct. 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.
Fort Worth Star-Telegram, 30 Oct. 2025
In the case of athletics, that funding often comes from sponsors, boosters, ticket sales and media revenue.
—William Melhado, Sacbee.com, 29 Oct. 2025
With Florida, Penn State and LSU looking for a new leader, Kiffin's resume with the Rebels looks like a no-brainer for any athletic director in need of a splashy hire to soothe itchy boosters.
—Jordan Sigler, MSNBC Newsweek, 29 Oct. 2025
The Bermuda Blue Citrus was available in unique cleaning, laundry, and air-freshening items, including a fragrance booster, laundry detergent sheets, fabric softener dryer sheets, an essential oil refill, and a solid air freshener gel.
—Rebecca Jones, Southern Living, 28 Oct. 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 2 Nov. 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