From Longman Dictionary of Contemporary Englishboosterboost‧er /ˈbuːstə $ -ər/ noun [countable] 1 MDa small quantity of a drug that increases the effect of one that was given before, so that someone continues to be protected against a disease a booster shot2 HELPsomething that helps someone or something to increase or improve, or to be more successful or confident a booster pump a profit booster for the companymorale/confidence booster Mail from home is a big morale booster for faraway troops.3 TTSa rocket that is used to provide extra power for a spacecraft to leave the Earth a giant booster rocket4 American EnglishSUPPORT A PERSON, GROUP, OR PLAN someone who gives a lot of support to a person, organization, or idea a dance organized by the school’s booster club
Examples from the Corpus
booster• The Atlantis boosters underwent the same repair procedure as those that launched Columbia.• The Christmas Day morale booster was only the game show host's second trip outside hospital since his near-fatal crash.• That kind of morale booster is infectious and they could well have won by a bigger margin.• This is important-if one booster had more thrust than the other, the craft might not leave the ground vertically!• This flyby mission could be flown on the reliable Proton booster and could be done quickly.• Both were launched by separate Proton boosters in June of 1983.• the Kennedy High School Booster Club• This isn't a good time, though, because September marked the start of the lucrative winter season for serious boosters.• The worst of the damage was found in joints in the middle of the boosters.morale/confidence booster• The Christmas Day morale booster was only the game show host's second trip outside hospital since his near-fatal crash.• He brings a joy and an ebullience to his work which is a fantastic morale booster for the cast.• Such fairs are a great morale booster for any nurse who feels unappreciated.• Voice over Seeing the parachutes back in the air has been a great morale booster for the base.• That kind of morale booster is infectious and they could well have won by a bigger margin. 