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syzygy [siz-i-jee] n.

- the nearly straight-line configuration of three celestial bodies in a gravitational system
- any two related things, either alike or opposite

Etymology:

Late Latin syzygia = conjunction, from Greek, from syzygos = yoked together, from syn- + zygon = yoke


Usage:

When all eight planets are aligned on the same side of the sun, it's called a grand syzygy.