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: 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
Example Sentences
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 In both cases, the boosters should be given at least two months after the last COVID-19 vaccine or booster. 
Beth Mole, Ars Technica, 2 Sep. 2022 Like with booster rates among those who aren’t pregnant, Black and Hispanic people trail behind. Duaa Eldeib, ProPublica, 4 Aug. 2022 Additionally, vaccination and booster rates are generally higher in the Bay Area, and anecdotally, some have observed that voluntary masking seems more common in the Bay Area than in L.A. County. Los Angeles Times, 25 July 2022 With the end of summer approaching — and with it, the start of school and more time spent indoors —Stenehjem said his greatest concern is Utah’s low booster rates. Paighten Harkins, The Salt Lake Tribune, 21 July 2022 Communities with a higher share of people who had earned at least an associate's degree tended to have higher Covid-19 vaccination and booster rates. Kristen Rogers, CNN, 22 June 2022 The city has led the nation in vaccination rates, but booster rates have stalled. New York Times, 19 May 2022 Two counties, Hamilton and Warren, have booster rates just above 50%. Terry Demio, The Enquirer, 4 Apr. 2022 Vaccination and booster shots are the best way to do that. Steve Sadin, Chicago Tribune, 15 Aug. 2022 See More
Beth Mole, Ars Technica, 2 Sep. 2022 Like with booster rates among those who aren’t pregnant, Black and Hispanic people trail behind. Duaa Eldeib, ProPublica, 4 Aug. 2022 Additionally, vaccination and booster rates are generally higher in the Bay Area, and anecdotally, some have observed that voluntary masking seems more common in the Bay Area than in L.A. County. Los Angeles Times, 25 July 2022 With the end of summer approaching — and with it, the start of school and more time spent indoors —Stenehjem said his greatest concern is Utah’s low booster rates. Paighten Harkins, The Salt Lake Tribune, 21 July 2022 Communities with a higher share of people who had earned at least an associate's degree tended to have higher Covid-19 vaccination and booster rates. Kristen Rogers, CNN, 22 June 2022 The city has led the nation in vaccination rates, but booster rates have stalled. New York Times, 19 May 2022 Two counties, Hamilton and Warren, have booster rates just above 50%. Terry Demio, The Enquirer, 4 Apr. 2022 Vaccination and booster shots are the best way to do that. Steve Sadin, Chicago Tribune, 15 Aug. 2022 See More Word History
First Known Use
1888, in the meaning defined above
Time Traveler
The first known use of booster was in 1888 Phrases Containing booster
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