plural of double bill

(baseball) A situation in which two baserunners attempt to steal a base simultaneously. This is usually called by the manager when there are runners on first base and second base.

plural of double steal

plural of double quasar

(astronomy) Two quasars that form a system, such that they gravitationally interact, or are part of the same cluster of galaxies; a binary quasar.

Much depends on the beginning of an endeavor.

a planet with a moon large enough to be considered a planet, were the planet not there, having a substantial portion of the system's overall mass.

(astronomy) a binary star

plural of dog house

plural of double kiss