Source : Webster's Revised Unabridged Dictionary (1913)

Seasonable \Sea"son*a*ble\, a.
   Occurring in good time, in due season, or in proper time for
   the purpose; suitable to the season; opportune; timely; as, a
   seasonable supply of rain.

         Mercy is seasonable in the time of affliction.
                                                  --Ecclus.
                                                  xxxv. 20.
   -- {Sea"son*a*ble*ness}, n. -- {Sea"son*a*bly}, adv.

Source : WordNet®

seasonableness
     n : being at the right time [syn: {timeliness}] [ant: {unseasonableness},
          {unseasonableness}]