different between synodic vs synodical

English

Latin synodicus, Ancient Greek ????????? (sunodikós, “of or related to an assembly or meeting”). Equivalent to synod +? -ic.

synodic (not comparable)

of, related to or produced by a synod; synodal
- 1664, Edward Stillingfleet, A Rational Account of the Grounds of Protestant Religion
  a synodical epistle
(astronomy) Of or pertaining to the conjunction of two or more heavenly bodies

synodical (not comparable)

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