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interplanetary (adj.)

1690s, "existing between planets," from inter- "between" + planet + -ary. In reference to travel between planets, attested from 1897. Boyle and Locke both used intermundane in the same sense; the Roman Epicureans had intermundia (neuter plural) for "spaces between the worlds" (translating Greek metakosmia).

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Definitions of interplanetary from WordNet

interplanetary (adj.)
between or among planets;
interplanetary travel
From wordnet.princeton.edu