Wiktionary
vb. To take ''(something)'' as one's major field of study in an institute of tertiary education (such as a college or university).
Usage examples of "major in".
At that moment the Solar Guard major in command of the Deimos spaceport entered, followed by Kit Barnard and Sid.
Tom stopped, clamped his mouth shut, and stared the major in the eye.
This was the reason he would never serve in England, and he gained his rank of Major in the 42nd regiment, the Highland Black Watch, composed entirely of Scotch noblemen.
Smith wore the uniform of a major in the Accord Quartermaster Corps.
A man showed up who persuaded the major in charge of the local office in an inexplicable manner that he was sent from Moscow with orders to pick up the prisoner.
Adams then rather daringly showed Henry a letter from a militia major in Massachusetts that concluded, After all, we must fight.
Adams then rather daringly showed Henry a letter from a militia major in Massachusetts that concluded, “.
Indeed, he'd been a major in Saint-Just's old Office of Internal Security, where he'd specialized in keeping an eye on the military.
American to put on the uniform of a major in the Nationalist Army?