Source : Webster's Revised Unabridged Dictionary (1913)

Outdated \Out*dat"ed\, a.
   Being out of date; antiquated. [Obs.] --Hammond.

Source : WordNet®

outdated
     adj : old; no longer in use or valid or fashionable; "obsolete
           words"; "an obsolete locomotive"; "outdated equipment";
           "superannuated laws"; "out-of-date ideas" [syn: {obsolete},
            {out-of-date}, {superannuated}]