Atmosphere Definition

The gaseous mass or envelope surrounding a celestial body, especially the one surrounding the earth, and retained by the celestial body's gravitational field.
American Heritage
The gaseous envelope (air) surrounding the earth to a height of c. 1,000 km (c. 621 mi): it is c. 21% oxygen, 78% nitrogen, and 1% other gases, and rotates with the earth, because of gravity.
Webster's New World
The air or climate in a specific place.
American Heritage
The gaseous mass surrounding any star, planet, etc.
Webster's New World
A unit of pressure equal to the air pressure at sea level. It equals the amount of pressure that will support a column of mercury 760 millimeters high at 0 degrees Celsius under standard gravity, or 14.7 pounds per square inch (1.01325 × 105 pascals).
American Heritage

Other Word Forms of Atmosphere



Origin of Atmosphere

  • From New Latin atmosphaera, from Ancient Greek ἀτμός (atmós, “steam”) + Ancient Greek σφαῖρα (sphaĩra, “sphere”); corresponding to atmo- +‎ -sphere (?).

    From Wiktionary

  • New Latin atmosphaera Greek atmos vapor wet-1 in Indo-European roots Latin sphaera sphere sphere

    From American Heritage Dictionary of the English Language, 5th Edition

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