1. conjunction of three astronomical objects: the straight-line conjunction or opposition of three astronomical objects such as the Sun, Earth, and Moon
2. pair of connected things: a pair of related things that are either similar or opposite
(
formal
)
3. poetry unit of two metrical feet: in classical verse, a metrical unit of two feet
[Early 17th century. Via late Latin< Greek suzugia< suzugos "paired" < zugon "yoke"]
