Syn-ŏd'ic or Syn-ŏd'ic-al, a.
a. [Fr. synodique, Lat. synodicus, Gr. συνοδικός.]
Sense 1. Of, or pertaining to, a synod; transacted in a synod; as, synodical proceedings or forms.
St. Athanasius writes a synodical epistle to those of Antioch, to compose the differences among them upon the ordination of Paulinus. Stillingfleet.
Sense 2. (Astron.) Pertaining to conjunction, especially to the period between two successive conjunctions; extending from one conjunction, as of the moon or a planet with the sun, to the next; as, a synodical month; the synodical revolution of the moon or a planet.