/ Dictionary / Index M magnetopause: Meaning and Definition of Find definitions for: mag•ne•to•pause Pronunciation: (mag-nē'tu-pôz"), [key] — n. Astron. the boundary between the earth's magnetosphere and interplanetary space, ab. 40,000 mi. (65,000 km) above the earth, marked by an abrupt decrease in the earth's magnetic induction. a similar feature of some other planet. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. magnetooptics magnetoplasmadynamics Related Content Daily Word Quiz: denizen Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language