1. a person who supports or promotes something enthusiastically
2. an additional dose of a vaccine given to maintain immunity
Usage: medical
3. a device that increases power, signal strength, or effectiveness
Usage: technical

Examples

• She’s been a booster of the arts program for years.
• The team needs more boosters to fill the stadium.
• I got my COVID booster shot last month.
• The cell phone booster improved our signal reception.
• The rocket’s booster separated after two minutes of flight.
• He installed a Wi-Fi booster to reach the basement.
• The booster club raised money for new uniforms.