: 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
Synonyms
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
Like the previous test, the aim was for Ship to make a splashdown in the Indian Ocean while the Super Heavy booster drops into the Gulf of Mexico near the SpaceX Starbase.
—
Andrew Paul, Popular Science, 6 June 2024
Last November, in a second test, the spacecraft and booster successfully separated, then both exploded shortly after, Space.com’s Josh Dinner wrote at the time.
—Will Sullivan, Smithsonian Magazine, 6 June 2024
SpaceX’s third test created a wealth of new data that showed a lack any critical safety issues, according to the FAA, although its upper stage fell to pieces on reentry and the company was forced to explode the Super Heavy booster above the Gulf of Mexico.
—William Gavin, Quartz, 6 June 2024
Remember this show is also honoring the late Rick Holden, a passionate arts advocate San Jose booster and leader of the effort to bring a permanent Levitt Pavilion concert stage to the park who died suddenly April 10.
—Sal Pizarro, The Mercury News, 30 May 2024
See all Example Sentences for booster 
Andrew Paul, Popular Science, 6 June 2024
Last November, in a second test, the spacecraft and booster successfully separated, then both exploded shortly after, Space.com’s Josh Dinner wrote at the time.
—Will Sullivan, Smithsonian Magazine, 6 June 2024
SpaceX’s third test created a wealth of new data that showed a lack any critical safety issues, according to the FAA, although its upper stage fell to pieces on reentry and the company was forced to explode the Super Heavy booster above the Gulf of Mexico.
—William Gavin, Quartz, 6 June 2024
Remember this show is also honoring the late Rick Holden, a passionate arts advocate San Jose booster and leader of the effort to bring a permanent Levitt Pavilion concert stage to the park who died suddenly April 10.
—Sal Pizarro, The Mercury News, 30 May 2024
See all Example Sentences for booster
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'booster.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
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Cite this Entry
“Booster.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/booster. Accessed 13 Jun. 2024.
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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