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booster (n.)

1890, "one who boosts" something, agent noun from boost (v.). Electrical sense is recorded from 1894. Young child's booster chair is attested under that name from 1957 (booster-seat is from 1956). Related: Boosterism (1914).

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Definitions of booster from WordNet

booster (n.)
a person who backs a politician or a team etc.;
booster (n.)
someone who is an active supporter and advocate;
Synonyms: promoter / plugger
booster (n.)
a thief who steals goods that are in a store;
Synonyms: shoplifter / lifter
booster (n.)
an amplifier for restoring the strength of a transmitted signal;
Synonyms: booster amplifier / booster station / relay link / relay station / relay transmitter
booster (n.)
the first stage of a multistage rocket;
Synonyms: booster rocket / booster unit / takeoff booster / takeoff rocket
booster (n.)
an additional dose that makes sure the first dose was effective;
Synonyms: booster dose / booster shot / recall dose
From wordnet.princeton.edu