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Adjective: ad hoc  'ad'hók
  1. Often improvised or impromptu
    "an ad hoc committee meeting"
  2. For or concerned with one specific purpose
    "a coordinated policy instead of ad hoc decisions"
Adverb: ad hoc  'ad'hók
  1. For one specific case
    "they were appointed ad hoc"

See also: specific, unplanned

Encyclopedia: Ad hoc