a person who leads spectators in traditional or formal cheering, especially at a pep rally or athletic event.

1900–05, Americanism; cheer + leader Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cheerleader (ˈtʃɪəˌliːdə)
a person who leads a crowd in formal cheers, esp at sports events

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1903, Amer.Eng., from cheer + leader. Cheerleading is attested from 1951.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Knockout color, simple bold shape, and stems as strong as a cheerleader's legs.
But of course you are a blind patriot who is a cheerleader for your country's
  criminal and genocidal policies.
Far be it from me to be the perky cheerleader who rallies the team during a
  less-than-stellar season.
But for a general election, a candidate must be more than a political
  cheerleader for a particular ideology.
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