Pronunciation: (siz'i-jē),[key] —n., —pl.-gies. 1. Astron.an alignment of three celestial objects, as the sun, the earth, and either the moon or a planet: Syzygy in the sun-earth-moon system occurs at the time of full moon and new moon. 2. Class. Pros.a group or combination of two feet, sometimes restricted to a combination of two feet of different kinds.
3. any two related things, either alike or opposite.