planetary: Meaning and Definition of

plan•e•tar•y

Pronunciation: (plan'i-ter"ē), [key]
— adj.
  1. of, pertaining to, or resembling a planet or the planets.
  2. wandering; erratic.
  3. terrestrial; global.
  4. 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.
—n.
  1. a planetary gear train.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also:
planetarium planetary nebula
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