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Definitions of binary:

noun:   a system of two stars that revolve around each other under their mutual gravitation
adjective:   consisting of two (units or components or elements or terms) or based on two
Example: "A binary star is a system in which two stars revolve around each other"

adjective:   of or pertaining to a number system have 2 as its base
Example: "A binary digit"

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Alternative Terms
hierarchical singly galaxy-external solar-system spectroscope celestial-mechanics gravitation parallax kilometre luminosity spectrum astronomical-spectroscopy doppler-effect inclination exhaust equipotential-surface inner-lagrangian-point evaporate loser accretion-disc roche-lobe accretion semidetached envelope engulf symbiotic-star white-dwarf-star thermonuclear outburst quiescence cataclysmic-variable nova neutron-star supernova luminous black-hole fast-pulsar degenerate inward chandrasekhar-limit type-ia-supernova nucleosynthesis universe-technology milky-way-galaxy-astro-in-encyclopedia variable-star eclipsing-variable-star proper-motion mass-luminosity-relation pulsar binary-star-band hubble-space-telescope sirius star-system star orbit center-of-mass astronomy-dragonland-album mass double-star-3 earth-disambiguation gravity spectroscopy eclipse multiple-star-2 stellar-evolution algol cygnus-x neologism william-herschel mizar-2 big-dipper ursa-major telescope optical-resolution interferometry light spectral-line occultation electromagnetic-radiation high-mass-x-ray-binary tolman-oppenheimer-volkoff-limit angular-resolution position-angle coordinates ellipse kepler-s-laws-of-planetary-motion semi-major-axis radial-velocity spectrometer circle trigonometric-function standard-candle large-magellanic-cloud-2 small-magellanic-cloud-2 andromeda-galaxy triangulum-galaxy annulus parsec sine-wave astrometry

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