from The American Heritage® Dictionary of the English Language, 4th Edition

  • adv. Without delay; instantly.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adv. immediately; instantly; without delay

from the GNU version of the Collaborative International Dictionary of English

  • adv. Immediately; instantly; at once.

from The Century Dictionary and Cyclopedia

  • At the present time; immediately; without delay: as, the party was compelled to plead instanter.


Medieval Latin, from Latin, urgently, from īnstāns, īnstant-, present; see instant.
(American Heritage® Dictionary of the English Language, Fourth Edition)



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  • (adv): old colloquial term that meant immediately or without delay; as "I will go instanter"

    January 15, 2009