booster

views updated May 18 2018

boost·er / ˈboōstər/ • n. 1. a person or thing that helps increase or promote something, in particular: ∎  a keen promoter of a person, organization, or cause: [as adj.] athletic booster clubs. ∎  a source of help or encouragement: job fairs are a great morale booster. ∎  Med. a dose of an immunizing agent increasing or renewing the effect of an earlier one. ∎  the first stage of a rocket or spacecraft, used to give initial acceleration. ∎  a device for increasing electrical voltage or signal strength.2. inf. a shoplifter.