Source : Webster's Revised Unabridged Dictionary (1913)

Outstanding \Out*stand"ing\, a.
   That stands out; undischarged; uncollected; not paid; as,
   outstanding obligations.

         Revenues . . . as well outstanding as collected. --A.
                                                  Hamilton.

Source : WordNet®

outstanding
     adj 1: distinguished from others in excellence; "did outstanding
            work in human relations"; "an outstanding war record"
     2: having a quality that thrusts itself into attention; "an
        outstanding fact of our time is that nations poisoned by
        anti semitism proved less fortunate in regard to their own
        freedom"; "a new theory is the most prominent feature of
        the book"; "salient traits"; "a spectacular rise in
        prices"; "a striking thing about Picadilly Circus is the
        statue of Eros in the center"; "a striking resemblance
        between parent and child" [syn: {prominent}, {salient}, {spectacular},
         {striking}]
     3: of major significance or importance; "a great work of art";
        "Einstein was one of the outstanding figures of the 20th
        century" [syn: {great}]
     4: owed as a debt; "outstanding bills"; "the amount still
        owed"; "undischarged debts" [syn: {owed}, {owing(p)}, {undischarged}]