The phrase "defining legacy" is correct and usable in written English.
You can use this phrase to describe a lasting influence that someone or something has left behind. For example, "Martin Luther King Jr. left behind a defining legacy of advocating for civil rights and equality."
Gavitt's defining legacy will be the Big East.
But for Mayor Oh Se-hoon, who has been striving to build a defining legacy, it was a signature moment.
But for Oh Se-hoon, who has been striving to build a defining legacy for his mayoralty, it was a signature moment.
And, years from now, that stylistic triumph, as much as the Warriors' championship itself, will most likely be the defining legacy of the 2015 Finals.
For fans, even casual ones, AFL Grand Finals are special, and each etches its own unique, defining legacy on the collective football memory.
The defining legacy of the Tulsa 2024 Games would be an Olympic stadium at the foot of River West Festival Park, the site of the city's Oktoberfest and the Polar Bear Plunge.
There's no question that this historic partnership on climate change will be one of the defining legacies of Obama's presidency".
After the attacks on the twin towers in September 2001 the Middle East became one of the defining legacies of Tony Blair's premiership, writes Jon Ungoed-Thomas.
Most occurred in Manhattan and western Brooklyn, stretching along the busiest corridors of a city where street safety and traffic engineering have been trumpeted as defining legacies of Mayor Michael R. Bloomberg's tenure.
Infrastructure could very well be one of the Filipino president's defining legacies.
With the swoop of a pen, President Donald Trump is set to dismantle what Barack Obama once hoped would be one of his administration's defining legacies: aggressive environmental protection.
