1. relating to or involving a synod (an ecclesiastical assembly)
Usage: ecclesiastical
2. relating to the conjunction or opposition of celestial bodies
Usage: astronomy

Examples

• The synodical meeting brought together bishops from across the region.
• Church leaders discussed reforms during the synodical assembly.
• The synodical period of the moon is approximately 29.5 days.
• Astronomers calculated the synodical revolution of the planet.
• The synodical constitution governed the church’s decision-making process.
• Ancient astronomers studied synodical cycles to predict eclipses.