Instantly meaning

ĭn'stənt-lē
At once.
adverb
2
0
As soon as.
conjunction
1
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With insistence; urgently.
adverb
0
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In an instant; without delay; immediately.
adverb
0
0
Urgently; pressingly.
adverb
0
0
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As soon as; the instant that.

I came instantly I saw the need.

conjunction
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(archaic) Urgently; with insistence. [from 15th c.]
adverb
0
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At once; without delay. [from 16th c.]

When the neighbours' dog barked, ours instantly replied with a howl.

adverb
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0

Origin of instantly

From instant +‎ -ly.