Major (education)
A major was an academic field of study that an individual concentrated on. 

Tom Paris majored in astrophysics at Starfleet Academy, a fact he divulged to Rain Robinson in 1996 when she expressed her surprise that he was smarter than she believed him to be. ()

In 2151,  apologized to Jonathan Archer for the mess in his quarters, saying sometimes he believed his bunkmate majored in chaos theory. ()

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Education