Word Story
As a noun, it points to the thing a person has chosen to go deepest into — a student's declared field of study, or the rank a military officer holds just above captain. As an adjective it is broader, describing whatever matters most in a given situation: the leading cause, the decisive factor, the risk that outweighs the rest. People reach for it constantly when they want to underline how much something mattered, as in describing a move abroad as the step that changed a family's life. Sports fans hear it every year when the biggest golf and tennis championships come around, since those events are grouped together as the majors. It sounds weighty without sounding dramatic, which is why it fits equally well in a school hallway and a news bulletin. Both senses share the same idea: something stands out from the rest by mattering more.