megawatt adjective 1noun 1forms 3 adjective1 •(figurative) Exceptionally powerful, intense, or enormous in impact.I also love the way you always greet me with a megawatt smile. — 2008 noun1 •One million (1 000 000) watts, an amount of power large enough to power such things as an entire commercial building or a small passenger aircraft. (Consuming 1 megawatt during a duration of 1 hour consumes 1 megawatt-hour of energy.) formsmegawatts · more megawatt · most megawatt