1.a. 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.
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.
4. To wear no underpants.
EX. Captain America teamed up with the Howling Commandos in WW2, Solid Snake is the most infamous commando in video games, and 1/4 members of Ron Burgundy's news team is probably going commando.