Oxford Dictionary English

    sergeant major

    noun
    noun
    BrE BrE//ˌsɑːdʒənt ˈmeɪdʒə(r)//
    ; NAmE NAmE//ˌsɑːrdʒənt ˈmeɪdʒər//
    (often used as a title)
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  1. 1a soldier of middle rank in the British army who is responsible for helping the officer who organizes the affairs of a particular regiment (= a large group of soldiers) Sergeant Major Phillips
  2. 2a soldier in the US army of the highest rank of non-commissioned officers
See sergeant major in the Oxford Advanced American Dictionary
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