/ Thesaurus / K Synonyms of kepler's law of planetary motion Find synonyms for: Noun1. Kepler's law, Kepler's law of planetary motion, law, law of natureusage: (astronomy) one of three empirical laws of planetary motion stated by Johannes KeplerWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: magnanimous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language