| 1. | Aeronautics. the ratio of the span of an airfoil to its mean chord. |
| 2. | Television. the ratio of the width of an image to its height, usually the ratio 4 to 3. |
| 3. | Naval Architecture. the ratio of the height of a rudder to its fore-and-aft length. |
| 4. | Rocketry.
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