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a colorless, odorless, gaseous element constituting about one-fifth of the volume of the atmosphere and present in a combined state in nature.
a colorless, odorless, gaseous element that constitutes about four-fifths of the volume of the atmosphere and is present in combined form in animal and vegetable tissues, especially in proteins:
a measure of the warmth or coldness of an object or substance with reference to some standard value
the state of the atmosphere with respect to wind, temperature, cloudiness, moisture, pressure, etc.
the study of the earth's atmosphere, esp of weather-forming processes and weather forecasting
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