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[in-ter-plan-i-ter-ee] /ˌɪn tərˈplæn ɪˌtɛr i/
being or occurring between the planets or between a planet and the sun.
Origin of interplanetary
1685-95; inter- + planetary Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for interplanetary
  • The researchers examined the interplanetary gravitational pull found there.
  • Many engines would be clustered together in orbit to give enough power for interplanetary travel.
  • But this would only possible if terrestrial bugs can survive the intense vacuum and radiation in interplanetary space.
  • When you go to the moon, you are making an interplanetary trip.
  • But an interplanetary conflict opens some grim possibilities.
  • If there were people on board the small interplanetary probe, no doubt they'd be popping champagne.
British Dictionary definitions for interplanetary


/ˌɪntəˈplænɪtərɪ, -trɪ/
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
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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
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