a planet of the solar system, as opposed to an asteroid (minor planet)
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
How to use major planet in a sentence
It had absolutely no parallel, for every other major planet had been known from time immemorial.Sir William Herschel: His Life and Works | Edward Singleton Holden
The eccentricity of its orbit, 0.0933, is greater than that of any other major planet except Mercury.
This was the major planet, surely one of the Dog Star's pack; and he had alighted on one of its moons.Palos of the Dog Star Pack | J. U. Giesy