English speakers reach for major whenever one thing outranks another: a serious illness, the larger share of a group, a scale that sits a half-step above its counterpart, an officer between captain and lieutenant colonel, or the subject a student chooses to dwell on. Law still uses the same word for a person of full age. Those jobs look scattered until the Latin comparative behind them is in view: maior, greater, the form English borrowed and then kept reassigning.
A Latin comparative in Middle English
The origin of the word major is a learned borrowing, not a native English coinage. Middle English scribes wrote majour and maiour. Standard references agree on the source and roughly on the century, but they do not line up on the first date. One widely used etymological handbook puts the adjective near 1300, already meaning greater, more important, or leading. The Oxford English Dictionary’s earliest cited evidence is later, around 1390, in the Middle English Stations of Rome. Merriam-Webster is content with the fourteenth century. The donor form is not in dispute: Latin maior, also spelled major, the comparative of magnus, great or large.
English took the word straight from Latin rather than through the everyday French channel that produced mayor. That split matters later. For the adjective, the path is inheritance of a comparative already complete in Latin, then spelling normalized toward the classical shape.
Greater than magnus
Latin did not build maior by clipping a regular suffix onto magnus in a transparent way that a modern learner can still see. It is an inherited comparative of an older stem, reconstructed for Proto-Italic along the lines of magjōs or majjōs. Behind that stands a Proto-Indo-European adjective for great, commonly given as a form of *méǵh₂s, with a comparative *méǵh₂yōs. American Heritage traces English major to that same root in its Indo-European appendix.
Cognates make the family easier to hold than the reconstructions do. Greek megas, Sanskrit mahat-, Hittite mekkish, and Armenian mets all point to greatness or largeness. English already had a native descendant in much. Scientific mega- is a later Greek loan into the same set. Magnitude, magnate, magnificent, and majority stay closer to the Latin positive magnus than to the comparative, but they show how thick the root became in learned English.
The morphology that English actually uses is the comparative itself. Speakers did not assemble major from a native prefix and a native root. They imported a ready-made greater-than form and, in several technical vocabularies, paired it with minor. That pairing is historical, not a folk story. Latin minor, lesser, became the conventional opposite in law, logic, and music, so the two words still travel as a set: major and minor illness, major and minor premise, major and minor key.
How the senses specialized
Most later English meanings are still specializations of greater. By the 1590s the adjective is recorded for greater quantity, number, or extent: the major part of a whole. From the 1690s musicians applied it to modes, scales, and chords whose characteristic interval is a half-step larger than the matching minor interval. A noun for that musical object is attested by the late eighteenth century; by 1811 writers could describe a modern mode as living in major tonality throughout.
Law kept a different Latin noun use. Maior could mean an elder or adult, so a major in English is also a person who has reached majority. Logic kept a related technical cut: the major term and the major premise of a syllogism are the ones that carry the broader predicate. None of these uses required a new root. They sorted greater along different axes: size, interval, age, and logical scope.
The military noun followed another route, and here the handbooks again disagree on date and on the immediate model. The compound sergeant-major is recorded in English from the 1570s. The Oxford English Dictionary treats the shortened rank as an English clipping of that compound, perhaps influenced by Spanish mayor in the same military sense, with evidence from 1575 in the soldier-writer Thomas Churchyard. Another standard etymology dates the rank to the 1640s and derives it from French major, itself a shortening of sergent-major, with Medieval Latin major already used for a chief officer. Both accounts share the same core. The title first named a greater sergeant, a staff officer whose duties were originally more senior than the modern field rank. In sixteenth-century Spanish armies the sargento mayor stood high in the infantry command. When the sergeant element later dropped from related titles, English was left with major and, further up the ladder, major general.
French majeur, Dutch majoor, and West Frisian majoar show neighboring languages taking the same Latin comparative into rank and into ordinary greater senses. An older Scottish verb, recorded in the early nineteenth century, meant to strut with a military bearing. That side-shoot did not last in general English.
Campus English
The academic uses are the most recent large expansion. By about 1890 American English had a noun for a student’s field of specialization. The verb, to major in a subject, follows in the 1910s: one handbook gives 1910, Merriam-Webster 1913. A history major is then both the field that occupies the greater share of a student’s work and the student who has chosen it. The comparison with a minor subject is still the old Latin pair, now wearing campus clothes.
A doublet that stayed in town hall
The cleanest leftover is not the campus sense but a twin that English already possessed. Mayor, from Old French maire, is the same Latin maior after it had become a title for the leading officer of a town. Major kept the learned Latin shape and the sense greater. Mayor kept the French shape and the municipal office. They are not synonyms, yet they are one comparative in two costumes: the officer who is greater in a city, and the adjective that still means greater everywhere else.