From The Collaborative International Dictionary of English v.0.48 :
Debarkation \De`bar*ka"tion\, n.
Disembarkation.
[1913 Webster]
The debarkation, therefore, had to take place by small
steamers. --U. S. Grant.
[1913 Webster]
From WordNet (r) 3.0 (2006) :
debarkation
n 1: the act of passengers and crew getting off of a ship or
aircraft [syn: debarkation, disembarkation,
disembarkment] [ant: boarding, embarkation,
embarkment]