Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A recreational aircraft constructed of lightweight materials such as aluminum, graphite composites, or high-strength plastics, having an engine of roughly 15 to 40 horsepower and often resembling a hang glider with wings.
  • adj. Very light.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Extremely light; weighing very little, of utmost lightness.
  • n. an aircraft that weighs very little

Etymologies

ultra- +‎ light (Wiktionary)

Examples

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