(astronomy) A small Solar System body consisting mainly of volatile ice, dust and particles of rock whose very eccentric solar orbit periodically brings it close enough to the Sun that the ice vaporises to form an atmosphere, or coma, which may be blown by the solar wind to produce a visible tail.

The fifth reindeer of Santa Claus.

(programming) A web application model in which a long-held HTTP request allows a web server to push data to a browser, without the browser explicitly requesting it.

plural of comet

cometary; relating to a comet.

(obsolete) cometary; relating to a comet.

Alternative form of periodic comet

(astronomy) A comet which orbits the Sun and which returns to the innermost point of its orbit at known, regular intervals.

(slang) A reduced-gravity aircraft, an airplane that briefly provides a nearly weightless environment by flying on a parabolic flight path; used to train astronauts or conduct research.

A great comet which can be seen from Earth every 75–76 years.