- being or occurring between the planets or between a planet and the sun.
Origin of interplanetary
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for interplanetary
The plan is to mine asteroids to be used on Earth and for interplanetary travel.James Cameron and Investors Seek to Lasso and Mine an Asteroid
April 24, 2012
But a vast amount of it will be spent in interplanetary doldrums, waiting to arrive at the destination.How Space Agencies Are Preparing for a Mission to Mars
February 12, 2011
I like interplanetary stories, if not written too far into the future.
But that's what makes these interplanetary movies great stuff.Reel Life Films
Samuel Kimball Merwin
The thing had already caused some interplanetary complications.
Without it, interplanetary flight would have been impossible.
He couldn't tell an interplanetary ship from an interstellar.Runaway
- of, relating to, or existing between planets
Word Origin and History for interplanetary
Online Etymology Dictionary, © 2010 Douglas Harper