immediately; at once.

Origin of instanter

1680–90; < Latin: urgently, insistently, equivalent to instan(t-) instant + -ter adv. suffix Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for instanter

Historical Examples of instanter

  • No, my lad, I'm not going to operate on you instanter, but I do want my reflector.

    The Leopard Woman

    Stewart Edward White

  • "You must duck, instanter, when you hear me call," said Will.

    Cricket at the Seashore

    Elizabeth Westyn Timlow

  • This was a masterly woman, and instanter she took the tide upon the flood.

    Once Aboard The Lugger

    Arthur Stuart-Menteth Hutchinson

  • But instanter our fears and the mystery of the appearance were dispelled, for it was my brother.

  • Wherefore, I think it were well that we set about doing what we decide to do instanter.

    My Dark Companions

    Henry M. Stanley

British Dictionary definitions for instanter



law without delay; (in connection with pleading) the same day or within 24 hours

Word Origin for instanter

C17: from Latin: urgently, from instans instant
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012