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channel a frequency band used by radio or television stations. [1/4 definitions]
frequency the number of energy waves that pass a certain point in a certain time period. Frequency is used to measure radio waves and other kinds of radiation. [1/3 definitions]
kilohertz a unit that measures the frequency of radio waves. One kilohertz is equal to one thousand cycles per second. (abbreviated: kHz)
microwave a type of radio wave with a high frequency. Microwaves are used to send messages over long distances and in special ovens to heat food and liquids. [1/2 definitions]
microwave oven an oven that cooks or heats food or beverages quickly using high-frequency radiation.