1 : (no object) : to leave a ship or airplane
The plane’s crew members were the last ones to disembark.
Passengers disembarked (=debarked) from the ship.
– opposite EMBARK
2 : (+ object) : to remove (something or someone) from a ship or airplane
They disembarked (=(more commonly) unloaded) the cargo at the dock.
– disembarkation noun (noncount)