being or occurring between the planets or between a planet and the sun.

Origin of interplanetary

First recorded in 1685–95; inter- + planetary Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for interplanetary

Contemporary Examples of interplanetary

Historical Examples of interplanetary

British Dictionary definitions for interplanetary



of, relating to, or existing between planets
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

Word Origin and History for interplanetary

1690s, "existing between planets," from inter- + planetary. In reference to travel between planets, attested from 1897.

Online Etymology Dictionary, © 2010 Douglas Harper