1PM an officer of middle rank in the British or US army or marines, or in the US airforce ➔ drum major
2 especially American EnglishSEC the main subject that a student studies at college or university :
Her major is history.
Her major is history.3 American EnglishSEC someone studying a particular subject as their main subject at college or university :
She's a history major.
She's a history major.
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