To make a continuous low-pitched buzzing or humming sound: I heard a plane zooming overhead. To move while making such a sound: couldn't hear as the motorcycle zoomed past. To move rapidly: comets that zoom through space. To increase suddenly and dramatically: Stock prices zoomed in early trading. To act or proceed swiftly and energetically: zoomed through the novel in a day. To simulate movement rapidly away from or toward a subject using a zoom lens or other optical device. Computers To cause text or other graphics in a window or frame to appear larger on the screen. The act or sound of zooming. A zoom lens.