Source : Webster's Revised Unabridged Dictionary (1913)

Tedium \Te"di*um\, n. [L. taedium, fr. taedet it disgusts, it
   wearies one.]
   Irksomeness; wearisomeness; tediousness. [Written also
   {t[ae]dium}.] --Cowper.

         To relieve the tedium, he kept plying them with all
         manner of bams.                          --Prof.
                                                  Wilson.

         The tedium of his office reminded him more strongly of
         the willing scholar, and his thoughts were rambling.
                                                  --Dickens.

Source : WordNet®

tedium
     n 1: the feeling of being bored by something tedious [syn: {boredom},
           {ennui}]
     2: dullness owing to length or slowness [syn: {tediousness}, {tiresomeness}]