The phrase 'unique and unprecedented' is both correct and usable in written English.
It can be used when describing something that is a new experience or event, one which has never happened before and can't easily be replicated. For example, "The success of the new product launch was unique and unprecedented, as it shattered all expectations of its potential."
"The aircraft is a unique and unprecedented survivor from the Battle of Britain and the Blitz.
In the report, Microsoft noted that such a licensing program is "unique and unprecedented in the industry".
In another section of this book Mr. Kagan writes that the United States "enjoys a unique and unprecedented ability to gain international acceptance of its power".
But in its hubris and attending hype, in its focus on earnings instead of ethics, in its insistence that it is unique and unprecedented -- in touting its innovative use of technology -- Enron stands as the quintessential Internet company.
Talking of jungle, I'm reminded of how sampling has created a unique and unprecedented form of pop rapture: the epiphany of suddenly, accidentally encountering the source track for a favourite tune.
It's a unique and unprecedented event: the original song-man from Jamaica, surrounded by musicians who have all left their mark on Britain's reggae, soul and jazz scenes down the decades – as are the gigs he's playing at the Constitution.
We find ourselves in a unique and totally unprecedented position.
"We find ourselves in a unique and totally unprecedented position," he said.
He explains that he considers the Holocaust both a unique and an unprecedented historical phenomenon, and one that, precisely for that reason, defies comprehension.
"We find ourselves in a unique and totally unprecedented position," said Mr. Cheney, a former secretary of defense and White House chief of staff.
That Gore has also lost the election despite winning the popular vote is the impression Dick Cheney Dick Cheney tried to give when he reiterated his complaint that Gore should concede: "We find ourselves in a unique and totally unprecedented position.
