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syz·y·gy

syzygy

pronunciation:
sI z ji
part of speech: noun
inflections: syzygies
definition 1: in astronomy, the alignment, either in conjunction or opposition, of three celestial bodies within the same gravitational system, esp. the sun, moon, and earth.
definition 2: in classical prosody, a metrical unit having two feet.
definition 3: any two things considered together, either as similar or opposite.
derivation: syzygial (adj.)