interplanetary

[in-ter-plan-i-ter-ee]

Origin of interplanetary

First recorded in 1685–95; inter- + planetary
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British Dictionary definitions for interplanetary

interplanetary

adjective
  1. 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
adj.

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

Online Etymology Dictionary, © 2010 Douglas Harper