Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adverb At once.
  • adverb With insistence; urgently.
  • conjunction As soon as.

from The Century Dictionary.

  • At the same time; simultaneously.
  • Immediately after; without any intervening time: as, to be instantly killed.
  • With urgency; insistently; earnestly; assiduously.

from the GNU version of the Collaborative International Dictionary of English.

  • adverb Without the least delay or interval; at once; immediately.
  • adverb With urgency or importunity; earnestly; pressingly.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adverb without any delay
  • adverb without delay or hesitation; with no time intervening

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From instant +‎ -ly.

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