ad hoc

from WordNet (r) 3.0 (2006)

ad hoc
    adv 1: for one specific case; "they were appointed ad hoc"
    adj 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"

from The Free On-line Dictionary of Computing (8 July 2008)

ad hoc

   Contrived purely for the purpose in hand rather than planned
   carefully in advance.  E.g. "We didn't know what to do about
   the sausage rolls, so we set up an ad-hoc committee".

   (1995-03-25)

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