a moment of time
happening or produced at once
(of food) which can be very quickly prepared for use
"if I had the chance I'd do it in a flash"
"the moment he arrived the party began"
"relief was instantaneous"
"your letter of the 10th inst"
"a crying need"
"regarded literary questions as exigent and momentous"
"an instant need"
He did see them, for a fleeting instant.
出自： G. Orwell
He has instant need of you.
出自： J. H. Newman