<p><strong>Verb (used without object):</strong></p><ul><li>To make a deep, prolonged, resonant sound.</li><li>To move with a resounding rush or great impetus.</li><li>To progress, grow, or flourish vigorously, as a business or a city.</li></ul><p><strong>Noun:</strong></p><ul><li>A deep, prolonged, resonant sound.</li><li>The resonant cry of a bird or animal.</li><li>A buzzing, humming, or droning, as of a bee or beetle.</li><li>A rapid increase in price, development, numbers, etc.: a boom in housing construction.</li><li>A period of rapid economic growth, prosperity, high wages and prices, and relatively full employment.</li><li>A rise in popularity, as of a political candidate.</li></ul><p><strong>Adjective:</strong></p><ul><li>Caused by or characteristic of a boom: boom prices.</li></ul>