| 1. | a post, stake, pale, or peg that is used in a fence or barrier, to fasten down a tent, etc. |
| 2. | a person stationed by a union or the like outside a factory, store, mine, etc., in order to dissuade or prevent workers or customers from entering it during a strike. |
| 3. | a person engaged in any similar demonstration, as against a government's policies or actions, before an embassy, office building, construction project, etc. |
| 4. | Military. a soldier or detachment of soldiers placed on a line forward of a position to warn against an enemy advance. |
| 5. | Navy, Air Force. an aircraft or ship performing similar sentinel duty. |
| 6. | to enclose within a picket fence or stockade, as for protection, imprisonment, etc.: to picket a lawn; to picket captives. |
| 7. | to fasten or tether to a picket. |
| 8. | to place pickets in front of or around (a factory, store, mine, embassy, etc.), as during a strike or demonstration. |
| 9. | Military.
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| 10. | to stand or march as a picket. |