Source : Webster's Revised Unabridged Dictionary (1913)

Booster \Boost"er\, n. (Elec.)
   An instrument for regulating the electro-motive force in an
   alternating-current circuit; -- so called because used to
   ``boost'', or raise, the pressure in the circuit.

Source : WordNet®

booster
     n 1: a person who backs a politician or a team etc.; "all their
          supporters came out for the game"; "they are friends of
          the library" [syn: {supporter}, {protagonist}, {champion},
           {admirer}, {friend}]
     2: someone who is an active supporter and advocate [syn: {promoter},
         {plugger}]
     3: a thief who steals goods that are in a store [syn: {shoplifter},
         {lifter}]
     4: the first stage of a multistage rocket [syn: {booster rocket},
         {booster unit}, {multistage rocket}, {takeoff booster}, {takeoff
        rocket}]
     5: an additional dose that makes sure the first dose was
        effective [syn: {booster dose}, {booster shot}, {recall
        dose}]

Source : Free On-Line Dictionary of Computing

Booster
     
        A {data-parallel} language.
     
        "The Booster Language", E. Paalvast, TR PL 89-ITI-B-18, Inst
        voor Toegepaste Informatica TNO, Delft, 1989.