Definitions

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

  • adverb For the specific purpose, case, or situation at hand and for no other.
  • adjective Formed for or concerned with one specific purpose.
  • adjective Improvised and often impromptu.

from The Century Dictionary.

  • noun To this; with respect to this (subject or thing); in particular.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective For this particular purpose.
  • adjective Special.
  • adjective Created on the spur of the moment; impromptu.
  • adverb On the spur of the moment.
  • adverb For a particular purpose.

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

  • adjective for or concerned with one specific purpose
  • adjective often improvised or impromptu
  • adverb for one specific case

Etymologies

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

[Latin : ad, to + hoc, neuter accusative of hic, this.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From New Latin ad hoc ("for this").

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Examples

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