The phrase "a major act of" is correct and usable in written English.
It can be used to describe a significant action or event, often in a formal or serious context.
Example: "The organization was recognized for a major act of charity that greatly impacted the local community."
Alternatives: "a significant act of" or "a substantial act of".
The NDEA stands as a major act of reform.
The Young Vic's current season of early Brecht plays is a major act of reclamation.
It doesn't seem a likely spot for a major act of innovation.
How is it that, in "Pavane," her remanipulation of that fabric becomes a major act of theatrical imagination?
For Gatland to nominate a Lions first-timer in the shape of the 24-year-old Warburton will be a major act of faith.
Returning to the Church, as Bruno knew, would have involved a major act of penance, including the disavowal of most of his writings.
Mr. Dimon, 53, is in the third major act of a career that has been chronicled by virtually every major financial publication, and in books about his former mentor, Sanford I. Weill.
Since 9/11, it seems like every time a country experiences its first major act of terror, that event is referred to as that country's 9/11.
Ever since the first trade center bombing in 1993, Ms. White's office has investigated a succession of major acts of terrorism in New York and around the world, including the activities of Osama bin Laden, the Saudi exile charged with leading the 1998 bombings of two American Embassies in Africa.
That said, there's been a significant increase in major acts of terrorism all over the world, and Bush's vanity war in Iraq has been a PR nightmare, creating much anger and hatred towards the United States as well as serving as a recruitment tool for al Qaeda and other terrorist groups.
The blast occurred in North Ossetia, a mostly Orthodox Christian area where major acts of violence have been rare in recent years compared with majority Muslim republics in the region, like Chechnya or Dagestan, where just last weekend a suicide bomber killed three people at a military installation.
