immediately; at once.

1680–90; < Latin: urgently, insistently, equivalent to instan(t-) instant + -ter adv. suffix Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
instanter (ɪnˈstæntə)
law without delay; (in connection with pleading) the same day or within 24 hours
[C17: from Latin: urgently, from instansinstant]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
State is given leave to amend the information by interlineation instanter.
The mandate is recalled for this purpose and this mandate is to be issued instanter.
On motion for leave to file motion for delayed reconsideration instanter.
Appellee sought and was granted leave to file its answer instanter.
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