Dictionary.net

a very short time (as the time it takes to blink once); "if I had the chance I'd do it in a flash"

demanding attention; "clamant needs"; "a crying need"; "regarded literary questions as exigent and momentous"- H.L.Mencken; "insistent hunger"; "an instant need"

in or of the present month; "your letter of the 10th inst"

demanding attention; "clamant needs"; "a crying need"; "regarded literary questions as exigent and momentous"- H.L.Mencken; "insistent hunger"; "an instant need"

in or of the present month; "your letter of the 10th inst"

Pressing; urgent; importunate; earnest.

Closely pressing or impending in respect to time; not deferred; immediate; without delay.

Present; current.

Instantly.

A day of the present or current month; as, the sixth instant; - an elliptical expression equivalent to the sixth of the month instant, i. e., the current month. See Instant, a., 3.

Pressing; urgent; importunate; earnest.

Closely pressing or impending in respect to time; not deferred; immediate; without delay.

Present; current.

Instantly.

A day of the present or current month; as, the sixth instant; - an elliptical expression equivalent to the sixth of the month instant, i. e., the current month. See Instant, a., 3.

Instantly.

Pressing, urgent: immediate: quick: without delay: present, current, as the passing month.

The present moment of time: any moment or point of time.

Urgent, immediate; passing; of the present month; as, the tenth instant.

A particular moment of time.

Immediate; urgent.

Moment of time.

Immediately impending.

Now passing; current.

A moment; second.

n. A point in duration ; a moment; —a particular time ;—a day of the present or current month.

Pressing, urgent; immediate, without any time intervening, present; quick, without delay.

Instant is such a part of duration wherein we perceive no succession ; the present or current month.