noun, plural syzygies.
1. Astronomy. 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. Classical Prosody. 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.
Origin: 1650-60; < Late Latin syzygia < Greek syzygía union, pair, equivalent to sýzyg (os) yoked together ( sy- sy- + zyg-, base of zeugnýnai to yoke+ -os adj. suffix) + -ia -y
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