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planetary Syllabification: plan·e·tar·y
Pronunciation: /ˈplanəˌterē/

Definition of planetary in English:


1Of, relating to, or belonging to a planet or planets: the laws of planetary motion
More example sentences
  • The Universe has its own heavenly sounds, such as pulsars, planetary magnetospheres and solar winds.
  • Jupiter is the largest of our nine planets, containing two-thirds of the planetary mass of our Solar System.
  • In 1954 he developed his work on dynamical systems in relation to planetary motion.
1.1Of or relating to the earth as a planet: planetary air pollution and climatic change
More example sentences
  • What are the odds of one of these things hitting the planet Earth and causing planetary devastation?
  • On behalf of all of us who work together for the good of the whole we urge the planetary members of the Earth to be on high alert.
  • The story is that huge earthquakes are ripping earth apart, and a planetary evacuation needs to be set underway.


Late 16th century: from late Latin planetarius 'relating to the planets' (recorded only as a noun meaning 'astrologer'), from planeta 'planet'.

Words that rhyme with planetary

interplanetary, sanitary
Definition of planetary in:
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