Source : Webster's Revised Unabridged Dictionary (1913)

Submergence \Sub*mer"gence\, n. [From L. submergens, p. pr.]
   The act of submerging, or the state of being submerged;
   submersion.

Source : WordNet®

submergence
     n : sinking until covered completely with water [syn: {submerging},
          {submersion}, {immersion}]