noun, verb, -ad⋅ed, -ad⋅ing.| 1. | Fortification. a defensive barrier consisting of strong posts or timbers fixed upright in the ground. |
| 2. | an enclosure or pen made with posts and stakes. |
| 3. | U.S. Military. a prison for military personnel. |
| 4. | to protect, fortify, or encompass with a stockade. |