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 /dɪsˌɛmˌbɑɚˈkeɪʃən/ noun [noncount]