From The Collaborative International Dictionary of English v.0.48:

operational \operational\ adj.
   1. of or pertaining to operations; as, operational procedure.
      [WordNet 1.5]

   2. Fit or ready for service; available and in working
      condition; as, an operational aircraft. Opposite of

   Syn: functional, usable, useable, in order(predicate), in
        working order(predicate), operable.
        [WordNet 1.5]

   3. (Mil.) of or intended for or involved in military
      operations. Opposite of nonoperational.
      [WordNet 1.5]

   4. In force; not expired or annulled; -- of rules or laws.
      [WordNet 1.5]

            de facto apartheid still operational even in the
            `new' African nations                 --Leslie
                                                  Marmon Silko
      [WordNet 1.5]
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