/ˈmeɪdʒər/
[adjective] Greater in size, importance, or seriousness than other things of the same kind. It can also describe a main subject of study at university, or a military rank above captain.
Every time you call something 'major', you are borrowing a Roman word that literally meant 'greater' — the same root that gave Rome its greatest title.
The story of 'major' begins in Latin, with the word 'magnus', meaning 'great' or 'large'. From 'magnus', Latin formed the comparative adjective 'maior' (sometimes written 'major'), meaning 'greater' or 'larger'. This was a regular comparison — just as English says 'great, greater, greatest', Latin said 'magnus, maior, maximus'. That superlative, 'maximus', gave English the word 'maximum', while 'maior' itself marched straight into English nearly unchanged.
The word entered English in the 14th century, arriving via Old French 'maire' and directly from Latin 'maior'. At first, its use in English was largely tied to logic and philosophy, where a 'major premise' was the more important or broader of two statements in a logical argument. This reflects the word's core meaning perfectly — something that is simply the greater of two things.
By the 16th century, 'major' had taken on a military meaning. A 'sergeant major' was a senior military officer, and over time the title shortened to simply 'major', referring to a specific rank. This use spread through European armies — French 'major', Spanish 'mayor', and others all trace back to the same Latin root. The military sense remains very much alive today.
Perhaps the most powerful descendant of Latin 'maior' is the word 'mayor'. Through the path Latin 'maior' → Old French 'maire' → Middle English 'maire' → English 'mayor', the word came to describe the chief official of a town or city — literally the 'greater' or most important person in local government. It is a striking thing to realise that your town's mayor and the musical term 'major key' are, at their heart, the same word.
The musical use of 'major' — as in a major key or major chord — came through Medieval Latin music theory, where 'maior' described the larger or fuller-sounding interval between notes, as opposed to the 'minor' (lesser) interval. This pairing of 'major' and 'minor' — from Latin 'minor', meaning 'smaller' — became central to Western music. The same Latin root 'minor' gave English words like 'minority', 'minus', and 'minute' (in the sense of very small).
In American English, 'major' took on a new life in the 20th century as a noun and verb describing a student's main field of study. To 'major in history' simply means to make history your greatest area of focus — a meaning that stays perfectly true to the Latin original. Across all its uses, from the battlefield to the concert hall to the university campus, 'major' has never strayed far from its ancient core: something that is simply, undeniably, the greater thing.