The phrase "a major rule" is correct and usable in written English.
It can be used when referring to an important guideline or regulation that is significant in a particular context.
Example: "One of the major rules of the competition is that all participants must submit their entries by the deadline."
Alternatives: "a key guideline" or "a significant regulation."
Although REFs have been shown to have applied a major rule to rank learning almost a decade ago [13, 15 17], in recent studies, little attention has been given to the design and selection of more appropriate ones.
While everyone was busy prepartying and donating money, the Academy quietly announced a major rule change to its members.
The E.P.A. designated the new regulations as a "major rule," which makes them subject to recall by Congress for 60 days.
Princeton University committed a major rule violation when a booster paid $33,000 toward the educational expenses of a tennis player, the N.C.A.A. announced Wednesday.
A major rule will take private vehicles off the roads on alternate days, depending on their license plates, when pollution is especially bad.
Meanwhile, the S.E.C. is about to consider a major rule governing hedge funds and other private companies that solicit investments from the public.
The timing of the new policy on existing power plants is driven in large part by the timetables the Clean Air Act sets for a major rule-making.
Passing through a wall to Platform 9 ¾ and hopping a magic train to Hogwarts would be a major rules violation.
The highly-complex nature of this year's cars following a major rules overhaul has so far posed untold problems for Red Bull.
The Department of Commerce housed the Internet Corporation for Assigned Names and Numbers (ICANN), a major rule-making body for the internet until it relinquished control in 2016 to a multi-stakeholder group.
Progress Seen in Advancing a Final Volcker Rule | A major new rule that has drawn the ire of Wall Street is on track for completion sooner than some bankers had expected, dashing the hopes of financial industry lobbyists, who have pressed for a delay.
