any of the specially trained Allied military units used for surprise, hit-and-run raids against Axis forces.
b.
a member of any of these units. Compare ranger(def. 3).
2.
any military unit organized for operations similar to those of the commandos of World War II.
3.
a member of a military assault unit or team trained to operate quickly and aggressively in especially urgent, threatening situations, as against terrorists holding hostages.
Origin: 1785–95; < Afrikaans kommando raid, raiding party, a unit of militia < Portuguese commando unit commanded, noun derivative of commandar to command