Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A machine or device, such as an airplane, helicopter, glider, or dirigible, capable of atmospheric flight.

from the GNU version of the Collaborative International Dictionary of English.

  • noun Any vehicle, such as an airplane, helicopter, balloon, etc., for floating in, or flying through, the air.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A vehicle capable of atmospheric flight due to interaction with the air, such as buoyancy or lift.
  • noun Plural form of aircraft.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a vehicle that can fly

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From air +‎ craft.

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