Major

In several Cybertronian military structures, Major is a rank, usually an Autobot one, lying above Minor and below Prime.

Fiction

Wings Universe

The Sentinel Prime of this universe was previously Sentinel Major during the time of the Quintessons' rule, before attaining the Matrix of Leadership. Ask Vector Prime/The AllSpark Almanac II

Around nine million years ago, a second Sentinel Major existed, The Coming Storm: Part 2 named in honor of the original. Ask Vector Prime, 2015/05/28

Animated cartoon continuity

The partners assigned to the various Omega Sentinels included numerous 'bots of Major rank, including Primal Major, Longrack Major, Silverbolt Major, Scattershot Major, Impactor Major, Hot Spot Major, Railspike Major, and Wedge Major. The AllSpark Almanac II

At one point, during his journey from Minor to Prime, Sentinel held the rank of Major. Ask Vector Prime, 2015/05/28

2005 IDW continuity

Nova Major became the leader of Prima's tribe after his master fled off-planet during the First Cybertronian Civil War. After the end of the war with the blessing of Alpha Trion, last of the Thirteen on Cybertron, Nova took on the mantle of Prime to become Nova Prime, sole leader of Cybertron. The Crucible

Domitius Major was a Maximal explorer who crash-landed on Earth; he and his crew were brainwashed by Shockwave into believing they were the real Autobots and Decepticons, and as a result Domitius came to believe that he was Optimus Prime. Strange Visitors

Ask Vector Prime

In the ancient days of Aurex 404.11 Kappa, Guardian Major was the lieutenant of Vector Prime, leader of the Autobots and holder of the Matrix of Leadership. Ask Vector Prime, 2015/07/12

Notes

• The Bot Shots character Ultra Major has "Major" in his name, but that is probably just a name and not a rank.