What does ultralight mean?
Ultralight describes something that is exceptionally light in weight, often in constructions, clothing, equipment, or vehicles. The intensifying prefix ultra- distinguishes it from an ordinary lightweight: the item is notably, sometimes remarkably, light. In aviation and recreational flying, an ultralight is a very light aircraft, typically powered by a small engine and intended for low-speed flight. The term can also suggest minimalism, portability, or efficiency, as in ultralight gear or ultralight construction. In general use it is usually an adjective, while as a noun it refers to a vehicle in the ultralight category. The word is common in British and American English, although formal aviation rules and pilot-certification terminology may vary by jurisdiction. In everyday writing, ultralight is best reserved for things that are demonstrably exceptionally light rather than used as a vague substitute for very light.
Exceptionally light in weight; requiring little effort to carry or support.
"The manufacturer used ultralight carbon fibre in the bicycle frame."
Often used for equipment, materials, vehicles, and constructions whose low weight is a notable feature.
A very light, low-powered aircraft, especially one designed for recreational flying.
"The two ultralights circled above the field before landing."
The noun is countable and is chiefly used in aviation and recreational contexts.
Used when referring to multiple ultralight aircraft.
"Several ultralights took off from the small airfield."
The word can describe a fabric, a tent, or even an aircraft: its promise is not merely that something is light, but that it is lighter than you might expect.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of ultralight
The word combines the Latin-derived prefix ultra-, meaning “beyond” or “farther than,” with light, from the Old English root represented in modern words such as lighten and lighthouse. The prefix ultra- developed a modern use meaning “extreme” or “beyond ordinary limits,” especially in scientific and technical vocabulary. The same prefix appears in ultraviolet, ultrasonic, and ultramarine.
Related word forms
How ultralight is actually used
The adjective is common in technical, sporting, outdoor, and design contexts. The noun is chiefly used in aviation and recreational flying, where formal classifications and certification requirements may differ by jurisdiction.
Easily confused with ultralight
Lightweight means relatively light or easy to carry, whereas ultralight emphasizes being exceptionally light in weight.