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interplanetary

[in-ter-plan-i-ter-ee] /ˌɪn tərˈplæn ɪˌtɛr i/
adjective
1.
being or occurring between the planets or between a planet and the sun.
Origin
1685-1695
1685-95; inter- + planetary
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for inter-planetary

interplanetary

/ˌɪntəˈplænɪtərɪ, -trɪ/
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
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Word Origin and History for inter-planetary

interplanetary

adj.

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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5
6
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