| 1. | an item of incidental information. |
| 2. | either of two lights carried by a vessel under way at night, a red one on the port side and a green on the starboard. |
| 3. | light coming from the side. |
| 4. | a window or other aperture for light in the side of a building, ship, etc. |
| 5. | a window at the side of a door or another window. |