Source : Webster's Revised Unabridged Dictionary (1913)

Mediaeval \Me`di*[ae]"val\, a. [L. medius middle + aevum age.
   See {Middle}, and {Age}.]
   Of or relating to the Middle Ages; as, medi[ae]val
   architecture. [Written also {medieval}.]

Source : WordNet®

mediaeval
     adj 1: relating to or belonging to the Middle Ages; "Medieval
            scholars"; "Medieval times" [syn: {medieval}]
     2: as if belonging to the Middle Ages; old-fashioned and
        unenlightened; "a medieval attitude toward dating" [syn: {medieval},
         {gothic}]