watt
n. countable B2 Upper Intermediate US //ˈwɑt// UK //wˈɒt// watt
n. a unit used to measure how much power or energy an electrical device uses. You see this number on light bulbs or heaters to know how strong they are.
n. the standard unit of power in the International System of Units, equivalent to one joule per second. It measures the rate of energy transfer or conversion.
This lamp uses a sixty-watt bulb.
The new solar panels can generate several thousand watts of power during peak sunlight hours.
Engineers must calculate the total wattage of all connected appliances to ensure the circuit can handle the load without tripping the breaker.
Usage
Often used in compound adjectives with a number, such as 'a 100-watt bulb'.