<p><strong>noun</strong></p><ul><li>Meteorology: a sudden, strong wind of brief duration that is sustained for at least two minutes at a speed of at least 16 knots (18 miles per hour, 8 meters per second), often accompanied by precipitation, and then rapidly diminishes in speed.</li><li>Nautical: any local storm on navigable water that is typically sudden and severe, with strong winds often accompanied by precipitation and sometimes thunder and lightning.</li><li>a sudden disturbance or commotion.</li></ul><p><strong>verb</strong></p><ul><li>(used without object) Meteorology, Nautical: to blow as a squall: They say it may squall, but I say we should go ahead with our picnic plans.</li></ul>