Source : Webster's Revised Unabridged Dictionary (1913)

Salinity \Sa*lin"i*ty\, n.
   Salineness. --Carpenter.

Source : WordNet®

salinity
     n 1: the taste experience when salt is taken into the mouth [syn:
           {salt}, {saltiness}]
     2: the relative proportion of salt in a solution [syn: {brininess}]