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Definition of "air" []

  • A colorless, odorless, tasteless, gaseous mixture, mainly nitrogen (approximately 78 percent) and oxygen (approximately 21 percent) with lesser amounts of argon, carbon dioxide, hydrogen, neon, helium, and other gases. (noun)
  • This mixture with varying amounts of moisture and particulate matter, enveloping the earth; the atmosphere. (noun)
  • The sky; the firmament. (noun)
  • A giant void; nothingness: The money vanished into thin air. (noun)
  • An atmospheric movement; a breeze or wind. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Use "air" in a sentence
  • "After about the year 1790, it was necessary to think of combustions in the air as combinations of a particular gas, or _air_, with the burning substances, or some portions of them."
  • ""To visitation of the impassive air," is a sonorous verse; but it is not Dante's verse, unless _all detached_ means _on every side is open to visitation_, and _impassive air_ means"
  • "This cylinder gives its full volume of air, and apparently a little more at times, because the air is admitted by a concentrated inlet in which free _air is always moving in one direction_."