definition of
booster

[1] #1 booster n. [supporter, protagonist, champion, admirer, friend] a person who backs a politician or a team etc.; "all their supporters came out for the game"; "they are friends of the library". wn

[2] #2 booster n. [promoter, plugger] someone who is an active supporter and advocate. wn

[3] #3 booster n. [shoplifter, lifter] a thief who steals goods that are in a store. wn

[4] #4 booster n. [booster amplifier, booster station, relay link, relay station, relay transmitter] an amplifier for restoring the strength of a transmitted signal. wn

[5] #5 booster n. [booster rocket, booster unit, takeoff booster, takeoff rocket] the first stage of a multistage rocket. wn