- A facing, as of masonry, used to support an embankment.
- A barricade against explosives.
From One Bullet Away, but Nathaniel Fick:
Jacobabad was a spook fest. A different team of scruffy-looking commandos lived in each revetment. “Lockheed and Boeing contractors” — masquerading CIA and Delta Force operators — mingled with Royal Marines, Special Air Service troopers, Air Force pilots, SEALs, and others. A mantainence crew patched bullet holes in a helicopter, while another group played touch football on the taxiway next to them.
The American Heritage Dictionary, Fourth Edition