'Drum major' definitions:

Definition of 'drum major'

From: WordNet
noun
The leader of a marching band or drum corps

Definition of 'Drum major'

From: GCIDE
  • Drum major \Drum" ma"jor\ .
  • 1. The chief or first drummer of a regiment; an instructor of drummers. [1913 Webster]
  • 2. The marching leader of a military band. [U.S.] [1913 Webster]
  • 3. A noisy gathering. [R.] See under Drum, n., 4. [1913 Webster]