Synodic

Origin

Latin synodicus, Ancient Greek συνοδικός (sunodikos, "of or related to an assembly or meeting"). Equivalent to synod + -ic.

Full definition of synodic

Adjective

1. of, related to or produced by a synod; synodalA synodical epistle — Bishop Stillingfleet.
2. (astronomy) Of or pertaining to the conjunction of two or more heavenly bodiesa synodical monththe synodical revolution of the moon or a planet