syzygy
by Feng
syz·y·gy
[siz-i-jee] 
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noun, plural -gies.
1.
Astronomy . an alignment of three celestial objects, as thesun, the earth, and either the moon or a planet: Syzygy inthe sun-earth-moon system occurs at the time of full moon andnew moon.
2.
Classical Prosody . a group or combination of two feet,sometimes restricted to a combination of two feet ofdifferent kinds.
3.
any two related things, either alike or opposite.
