Etymology
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cheerleader (n.)

also cheer-leader, 1900, American English, from cheer (n.) + leader. Cheerleading is attested from 1906.

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Definitions of cheerleader

cheerleader (n.)
an enthusiastic and vocal supporter;
he has become a cheerleader for therapeutic cloning
cheerleader (n.)
someone who leads the cheers by spectators at a sporting event;
From wordnet.princeton.edu