: 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 primary among them include two stage rocket boosters and Common-Hypersonic Glide Body (C-HGB) subsystems.
—
Adityajadhav, Interesting Engineering, 14 May 2026
Sulwhasoo Spa focuses on heritage ingredients like ginseng, while D&A and Individuel Genève specialize in skin boosters and laser treatments.
—Hanna Wickes, Charlotte Observer, 14 May 2026
But Trump in 2026 has gone full chamber-of-commerce booster, cheering on those in the top ranks of the Chinese Communist Party, including President Xi Jinping.
—Vivian Salama, The Atlantic, 14 May 2026
Unsurprisingly, Tigers athletic director Verge Ausberry had his new head coach's back while trashing former coach Brian Kelly and his inability to relate to boosters or fans during his time in Baton Rouge.
—Austin Perry Outkick, FOXNews.com, 14 May 2026
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.
Adityajadhav, Interesting Engineering, 14 May 2026
Sulwhasoo Spa focuses on heritage ingredients like ginseng, while D&A and Individuel Genève specialize in skin boosters and laser treatments.
—Hanna Wickes, Charlotte Observer, 14 May 2026
But Trump in 2026 has gone full chamber-of-commerce booster, cheering on those in the top ranks of the Chinese Communist Party, including President Xi Jinping.
—Vivian Salama, The Atlantic, 14 May 2026
Unsurprisingly, Tigers athletic director Verge Ausberry had his new head coach's back while trashing former coach Brian Kelly and his inability to relate to boosters or fans during his time in Baton Rouge.
—Austin Perry Outkick, FOXNews.com, 14 May 2026
See All Example Sentences for booster
Cite this Entry
“Booster.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/booster. Accessed 21 May. 2026.
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
