Source : Webster's Revised Unabridged Dictionary (1913)

Subsidence \Sub*sid"ence\, Subsidency \Sub*sid"en*cy\, n. [L.
   subsidens, -entis, p. pr. of subsidere. See {Subside}.]
   The act or process of subsiding.

         The subdual or subsidence of the more violent passions.
                                                  --Bp.
                                                  Warburton.

Source : WordNet®

subsidence
     n 1: an abatement in intensity or degree (as in the
          manifestations of a disease); "his cancer is in
          remission" [syn: {remission}, {remittal}]
     2: a gradual sinking to a lower level [syn: {settling}, {subsiding}]
     3: the sudden collapse of something into a hollow beneath it
        [syn: {cave in}]