Source : Webster's Revised Unabridged Dictionary (1913)

Disembarkation \Dis*em`bar*ka"tion\, n.
   The act of disembarking.

Source : WordNet®

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