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The phrase 'fleeting event' is correct and usable in written English.
You can use it to describe an event that is brief, short-lived, and quickly gone. For example, "The fireworks display was a fleeting event, over in a few minutes to the disappointment of the children."
Exact(4)
One of the biggest challenges is that the Olympics is a fleeting event — a few weeks every two years — and interest has been just as cyclical.
Unlike most portraiture from photography's early years, in which scowling sitters seem stiff and angry because of the long exposure times, she appears unusually alive as she looks off to her right, as if momentarily distracted by some fleeting event.
So taking a 37-hour journey from my home in Pennsylvania to north Queensland, Australia, to view such a fleeting event may not seem like a natural vacation, especially not with your family in tow.
Dental eruption is a fleeting event that is under greater environmental influence (Demirjian et al. 1973).
Similar(56)
Before astronomers were able to predict the timing of an eclipse, they were unexpected, fleeting events.
To say that waves and the rides they provide are inherently fleeting events, and that surfers naturally therefore want mementos, barely begins to explain the mania for photographs.
His music inhabits an instantly recognisable soundworld of fragile, fleeting events that are often teetering on the edge of inaudibility, pushing instruments to the limits of their ranges and pitching voices into ambiguous territory somewhere between song and whispered speech.
Here, all of reality is a contraption: My grandmother didn't open the mail with the hearing date; the broken windshield was on my father's car, but we sold it that week; I was in the hospital when I was supposed to come here; and, of course, the millimeter-by-millimeter accounts of fleeting events at some stop sign near Livonia Avenue six months ago, in the blazing summertime.
And there might also be cases of "knowledge without a shelf life," that is, knowledge of fleeting events that affect our decision-making for only an instant, after which time knowledge of such events will forever after be practically irrelevant, or at least no more practically relevant than a mere true belief that such events occurred (Hyman 2010: 409).
But since the era of quantum physics began over a century ago, invisible things and fleeting events have entered science, so subtly that the realm from which they emerge is almost a matter of faith.
It is particularly difficult to observe early or fleeting events in cell-cell contact by this approach, since this method requires finding cell pairs which are on the verge of contact, and observing them until they consummate their contact, or do not.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com