Definitions

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

  • n. In the traditional model of solar systems, a celestial body larger than an asteroid or comet, illuminated by light from a star, such as the sun, around which it revolves.
  • n. A celestial body that orbits the sun, has sufficient mass to assume nearly a round shape, clears out dust and debris from the neighborhood around its orbit, and is not a satellite of another planet.
  • n. One of the seven celestial bodies, Mercury, Venus, the moon, the sun, Mars, Jupiter, and Saturn, visible to the naked eye and thought by ancient astronomers to revolve in the heavens about a fixed Earth and among fixed stars.
  • n. One of the seven revolving astrological celestial bodies that in conjunction with the stars are believed to influence human affairs and personalities.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A large body which directly orbits any star (or star cluster) but which has not attained nuclear fusion.
  • n. In phrases such as the planet, this planet, sometimes refers to the Earth.

from the GNU version of the Collaborative International Dictionary of English

  • n. A celestial body which revolves about the sun in an orbit of a moderate degree of eccentricity. It is distinguished from a comet by the absence of a coma, and by having a less eccentric orbit. See solar system.
  • n. A star, as influencing the fate of a men.

from The Century Dictionary and Cyclopedia

  • n. A star other than a fixed star: a star revolving in an orbit.
  • n. Same as planeta
  • n.

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

  • n. a person who follows or serves another
  • n. any celestial body (other than comets or satellites) that revolves around a star
  • n. (astronomy) any of the nine large celestial bodies in the solar system that revolve around the sun and shine by reflected light; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto in order of their proximity to the sun; viewed from the constellation Hercules, all the planets rotate around the sun in a counterclockwise direction

Etymologies

Middle English, from Old French planete, from Late Latin planēta, from Greek planētēs, variant of planēs, planēt-, from planāsthai, to wander.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Middle English planete, from Old English planēta ("planet, chasuble"), from Latin planeta, planetes, from Ancient Greek πλανήτης (planētēs) variant of πλάνης (planēs, "wanderer, planet"), from Ancient Greek πλανάω (planáō, "wander about, stray"), of unknown origin. Perhaps from a Proto-Indo-European *pel- (“to wander, roam”), cognate with Latin pālor ("wander about, stray"), Old Norse flana ("to rush about"), Norwegian flanta ("to wander about"). More at flaunt. (Wiktionary)

Examples

  • In short, no envy, hatred, malice, and all uncharitableness; no vice, or meanness, or cheating, or any of the abominations of the planet Terra, and _we come from that planet_.

    A Honeymoon in Space

  • *grumbles sumfin aboat leevin a frozzin planet tu go tu a lava planet* Bye!

    Invisible Tarzan vine - Lolcats 'n' Funny Pictures of Cats - I Can Has Cheezburger?

  • The word planet comes from the Greek word πλανήτης (planetes) which is derived from the word

    CreationWiki - Recent changes [en]

  • Two years ago the International Astronomical Union IAU elected to define the term planet, restricting it to the eight largest bodies orbiting the Sun, and deleting Pluto from the list.

    NASA Watch: Keith Cowing: September 2008 Archives

  • But when the International Astronomical Union created its formal definition of the word planet in 2006 - and demoted Pluto by doing it - there was nothing in the fine print about how the object had formed.

    TIME.com: Top Stories

  • Some planetary theorists argued that the term "planet" should only apply to the latter, even if two objects have exactly the same mass.

    TIME.com: Top Stories

  • These worlds reflect visible light rather than shining in their own right in visible wavelengths, but why should we restrict the definition of the term planet to just those wavelengths that we can see?

    Astroprof's Page

  • Our word planet comes from a Greek verb meaning to wander.

    Jihad Watch

  • Change how astronomers define the term planet, eh?

    dispatches from TJICistan

  • Similarly, our planet is our house, and we should maintain it with care, to ensure our happiness and the happiness of our children, of our friends, and of all the sentient beings who share this great dwelling place.

    'My Spiritual Journey,' by The Dalai Lama

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Comments

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  • Planets in astrology have a different meaning to the modern astronomical understanding of what a planet is. Astrology utilises the ancient geocentric model of the universe in its calculations and thus employs the term in its original geocentric sense. Before the age of telescopes, the night sky was observed to consist of two very similar components: fixed stars, which remained motionless in relation to each other, and wandering stars, (in ancient Greek: asteres planetai) which appeared to shift their positions relative to the fixed stars over the course of the year. To the Greeks and the other earliest astronomers, this group comprised the five planets visible to the naked eye and excluded the earth. Although strictly the term "planet" applied only to those five objects, the term was latterly broadened, particularly in the Middle Ages, to include the Sun and the Moon (sometimes referred to as "Lights"), making a total of seven planets. Astrologers retain this definition today.
    _Wikipedia

    February 24, 2008

  • '"And yesterday the planet seemed to be going so well..."' -The Hitchhiker's Guide to the Galaxy, by Douglas Adams

    February 18, 2008

  • "What is the use of a house if you haven't got a tolerable planet to put it on?" - Henry David Thoreau

    December 11, 2007

  • Of course. comet actually comes from the Greek for long-haired star, so they were considered more like stars than planets, although it makes much more sense to think of them as planets, since they orbit the sun.

    October 15, 2007

  • And comets, right?

    October 15, 2007

  • This makes a lot of sense. Besides the sun and the moon, the planets are the only heavenly bodies which don't follow progress through the ecliptic.

    October 14, 2007

  • “Wanderer�?

    October 14, 2007