There is currently only one astrononical definition for the tag 'binaries'.
binary star, binaries, double star
algolvariablestar, rscanumvenaticorumstar, astrometricbinarystar, closebinarystar, contactbinarystar, detachedbinarystar, eclipsingbinarystar, ellipsoidalvariablestar, eruptivebinarystar, interactingbinarystar, semidetachedbinarystar, spectroscopicbinarystar, visualbinarystar, widebinarystar
accretion, apocenter, centerofmass, companionstar, dynamicalparallax, inclination, massloss, massratio, multiplestar, occultation, orbitdetermination, orbit, period, periodchange, perioddetermination, phasewave, positionangle, runawaystar, semimajoraxis, separation, twobodyproblem, vonzeipeltheorem