1. relating to the conjunction of two celestial bodies, especially as seen from Earth
Usage: astronomy
2. relating to a synod or church assembly
Usage: ecclesiastical

Examples

• The synodic month is the time between successive new moons.
• Mars has a synodic period of about 26 months as observed from Earth.
• The synodic cycle of Venus takes approximately 584 days.
• Ancient astronomers carefully tracked synodic periods of the planets.
• The bishop attended the synodic meeting to discuss church policies.
• Synodic decisions require approval from multiple church representatives.