"one-time opportunity" is a correct and usable phrasing in written English, and is usually used to refer to a rare chance that may not come again.
For example: "It's a once-in-a-lifetime opportunity to explore the Amazon rainforest, so don't miss out!".
It's as if we slow down for a second we fear we may miss out on a one-time opportunity.
(People who already own annuities will have a one-time opportunity to switch from one variable contract to another, tax free).
In 2004, the world has a one-time opportunity to make good on this global investment by ending transmission of poliovirus, now and forever.
"I encourage our customers to take advantage of this one-time opportunity to find exceptional discounts on their favorite books and other great merchandise".
Under "continuous coverage," Americans would be given a one-time opportunity to buy insurance at prices that aren't based on health status.
"This is a one-time opportunity," said Joe Martens, president of the Open Space Institute.
As Tilly puts it, businessmen started to see "individual transactions as links in a larger chain of profitable business ventures," instead of just "one-time opportunities to be exploited to the utmost".
Far from being great companies birthed whole, the backstories of today's giants involve involve twists, turns, one-time opportunities, and unexpected constraints.
They give us as parents one-time opportunities to say things to our children that will stick with them not only because of what is said, but because of when it is said.
Attached to the letter is a document titled "Addendum to the Series Rules," which states that "in the event the Little Genius answers question 1, 2, 3, or 4 incorrectly, the contestants will be entitled to the one (1) time opportunity, but not the obligation, to restart game play with a new question set".
The differential between these values clearly demonstrates the substantially greater potential in the existing housing market, even given the fact that existing home retrofits represent a "one time" opportunity, while housing codes influencing new homes would affect construction over multiple years.
