The Collaborative International Dictionary
Instanter
Instanter \In*stan"ter\, adv. [L., vehemently, earnestly. See Instant, n. & a.] Immediately; instantly; at once; as, he left instanter.
Wiktionary
instanter
adv. immediately; instantly; without delay
Usage examples of "instanter".
Do you understand what it is to say to a woman in a declaration which ought to be passionate, but at the same time tender and gentle, the following terrible words: "'Madam, make your choice, either one or the other, and decide instanter!
For a moment he was mightily minded to whip out dagger and end it instanter here with the swift upward jerk under the breastbone, or the shrewd thrust from behind at the base of the skull, or the well-known slash under the ear in the angle of the jaw.