from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Existing or occurring between planets.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Existing or occurring between planets
from the GNU version of the Collaborative International Dictionary of English
- adj. Between planets.
from The Century Dictionary and Cyclopedia
- Situated between the planets; within the solar system, but not within the atmosphere of the sun or any planet.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. between or among planets
inter- + planetary (Wiktionary)