1. The gaseous mass or envelope surrounding a celestial body, especially the one surrounding the earth, and rened by the celestial body's gravitational field.
2. Ther or climate in a specific place.
3. Abbr. atmPhysics A unit of pressure equal to ther 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).
4. A dominant intellectual or emotional environment or attitude:an atmosphere of distrust among the electorate.
5. The dominant tone or mood of a work of art.
6. An aesthetic quality or effect, especially a distinctive and pleasing one, associated with a particular place:a restaurant with an Old World atmosphere.
[New Latinatmosphaera : Greekatmos, vapor; see wet-1 in the Appendix of Indo-European roots + Latinsphaera, sphere; see SPHERE.]
(click for a larger image)atmosphere
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.