Source : Webster's Revised Unabridged Dictionary (1913)

Disembarkment \Dis`em*bark"ment\, n.
   Disembarkation. [R.]

Source : WordNet®

disembarkment
     n : the act of passengers and crew getting off of a ship or
         aircraft [syn: {debarkation}, {disembarkation}] [ant: {boarding}]