from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun astronomy Two stars which form a
stellar system, such that they orbitthe point of equilibriumof their gravitational fields; a binary star.
- noun astronomy Two stars that appear to be one when seen with the
naked eye, either because they orbitone another (binary stars) or happen to be in the same line of sighteven though they are separatedby a great distance( optical binaries).
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a system of two stars that revolve around each other under their mutual gravitation
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