planetary

[ plan-i-ter-ee ]
/ ˈplæn ɪˌtɛr i /

adjective

of, relating to, or resembling a planet or the planets.
wandering; erratic.
terrestrial; global.
Machinery. noting or pertaining to an epicyclic gear train in which a sun gear is linked to one or more planet gears also engaging with an encircling ring gear.

noun

Machinery. a planetary gear train.

QUIZZES

HEED THE VOX POPULI, AND TAKE THIS WORD OF THE DAY QUIZ!

Test your memory on these verbal firecrackers from the week of June 29 to July 5!
Question 1 of 7
anchorite

Origin of planetary

From the Latin word planētārius, dating back to 1585–95. See planet, -ary

OTHER WORDS FROM planetary

non·plan·e·tar·y, adjective

WORDS THAT MAY BE CONFUSED WITH planetary

planetary plenary plentiful plenitude
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for planetary

British Dictionary definitions for planetary

planetary
/ (ˈplænɪtərɪ, -trɪ) /

adjective

noun plural -taries

a train of planetary gears
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for planetary

planet
[ plănĭt ]

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.
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. The eight planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Pluto was considered to be a planet until its reclassification in 2006 as a dwarf planet. A planetlike body with more than about ten times the mass of Jupiter would be considered a brown dwarf rather than a planet. See also extrasolar planet inner planet outer planet.

Other words from planet

planetary adjective
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.