Booster

Noun

 * 1) Something that boosts.
 * 2) The first stage of a multistage rocket that provides the thrust for liftoff and the initial flight
 * 3) Someone who is a fan or supporter of something.
 * 4) A member of a booster club.
 * 5) A booster dose.
 * When did you get your last tetanus booster?
 * 1) (military)  An auxiliary or initial propulsion system which travels with a missile or aircraft and which may or may not separate from the parent craft when its impulse has been delivered.  A booster system may contain, or consist of, one or more units.
 * 2) (military) A high-explosive element sufficiently sensitive so as to be actuated by small explosive elements in a fuze or primer and powerful enough to cause detonation of the main explosive filling.

Thesaurus
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