drum major

n.
A man who leads a marching band or drum corps, often twirling a baton.

The musician in charge of a band or musical unit. Usually elaborately dressed and carrying a baton which is used to signal changes in march and to provide a tempo to the music. Usually holding the rank of a staff noncommissioned officer.

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The noun has one meaning:

Meaning #1: the leader of a marching band or drum corps

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drum major