Light-air meaning

A wind with a speed of from 1 to 3 knots (1.15 to 3.5 miles per hour; 1.9 to 5.6 kilometers per hour), according to the Beaufort scale.
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A wind whose speed is 1 to 3 miles per hour.
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(meteorology, nautical) A light wind with wind speed between 0,3 and 1,5 m/s; a Force 1 wind strength on the Beaufort scale.
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