The phrase "a mere possibility" is correct and usable in written English.
It can be used to express that something is only a slight chance or likelihood of occurring, often downplaying its significance.
Example: "While there is a mere possibility of rain tomorrow, I think we should still go ahead with our picnic plans."
Alternatives: "just a possibility" or "only a chance".
"Likelihood of confusion" signifies more than a mere possibility.
Each of these four paths is a mere possibility — and none are particularly likely to occur.
Last Easter no one had heard of Margy and the club was a mere possibility.
It's clear that we all do believe in the possibility, indeed, more than a mere possibility, the actuality of meetings that occur without us.
And according to a number of recent studies, catastrophe — a rise in temperature so large as to be almost unthinkable — can no longer be considered a mere possibility.
According to AG Wahl, for rebates to be capable of restricting competition, it is not sufficient for anticompetitive foreclosure to be a "mere possibility" or even "more likely than not" (paragraph 117).
On a practical ground, the mere possibility of success in obtaining a recovery has a chilling effect on charitable fund raising.
When we look at the last eight elected presidents, only Carter faced a situation worse than Obama's: approval ratings in the low 30s rather than low 40s, the likelihood rather than the mere possibility of a recession, a primary challenge rather than a clear path to renomination and a crisis in Iran rather than a string of foreign-policy victories.
Second, government credibility is important: when a government cannot credibly commit, the mere possibility of a short-run tax could severely harm incentives for future investments in lifetime-extending refurbishment or new plants.
The larger purpose of The Death of a Prophet exceeds the mere possibility of adjusting the date of Muhammad's death by a few years; far more important to Shoemaker are questions about the manner in which Islamic origins should be studied.
In 1996, a NASA study caused a sensation when it announced the mere possibility of fossilized bacteria in a meteorite believed to be from the Red Planet.
