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The description of the word you requested from the astronomical dictionary is given below.
The temperature is a measure for how hot something is. There are several units in use for temperature. In Europe, the most common unit is the degree Celsius (written ℃). In the USA, the degree Fahrenheit is used (℉). In science, the kelvin (no capital letters; also written K ― without °) is used a lot. The freezing point of water at sea level on Earth is at 0℃, 32℉, and 273 K. The boiling point of water is then at 100℃, 212℉, and 373 K.