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interplanetary

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in⋅ter⋅plan⋅e⋅tar⋅y

[in-ter-plan-i-ter-ee]
–adjective
being or occurring between the planets or between a planet and the sun.

Origin:
1685–95; inter- + planetary
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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in·ter·plan·e·tar·y   (ĭn'tər-plān'ĭ-těr'ē)   
adj.  Existing or occurring between planets.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

interplanetary 
1691, "existing between planets," from inter- + planet. In ref. to travel between planets, attested from 1897.
Online Etymology Dictionary, © 2001 Douglas Harper
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