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  1. AIR Definition & Meaning - Merriam-Webster

    The meaning of AIR is the mixture of invisible odorless tasteless gases (such as nitrogen and oxygen) that surrounds the earth; also : the equivalent mix of gases on another celestial object …

  2. Air | Composition, Oxygen, Nitrogen | Britannica

    Sep 12, 2025 · Air, mixture of gases comprising the Earth’s atmosphere. The mixture contains a group of gases of nearly constant concentrations and a group with concentrations that are …

  3. Air - National Geographic Society

    Oct 1, 2024 · Air is the invisible mixture of gases that surrounds Earth. Air contains important substances, such as oxygen and nitrogen, that most species need to survive.

  4. Air - Simple English Wikipedia, the free encyclopedia

    Air is a mixture of many gases and tiny dust particles. It is the clear gas in which living things live and breathe. It has an indefinite shape and volume. It has mass and weight, because it is …

  5. Air - definition of air by The Free Dictionary

    1. Of or relating to the air or the movement of air: an air tube. 2. Existing or living in the air; aerial. 3. Powered by compressed air: an air horn. 4. Containing or inflated by air.

  6. AIR | English meaning - Cambridge Dictionary

    AIR definition: 1. the mixture of gases that surrounds the earth and that we breathe: 2. the space above the…. Learn more.

  7. Air Definition & Meaning | YourDictionary

    Air definition: An atmospheric movement; a breeze or wind.

  8. What's in the Air? - Center for Science Education

    Air is a mixture of gases, most of which are naturally occurring. Air also contains a significant amount of human-made air pollutants, including some that are not safe to breathe and some …

  9. Air - Energy Education

    Air is a mixture of several gases that is a precious resource and a necessity of life. Pure air is completely invisible and odourless, however pollutants in the air can cause it to have a …

  10. AIR Definition & Meaning | Dictionary.com

    Air definition: a mixture of nitrogen, oxygen, and minute amounts of other gases that surrounds the earth and forms its atmosphere.. See examples of AIR used in a sentence.