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synodic

adjective
syn·​od·​ic | \sə-ˈnä-dik \
variants: or synodical \sə-​ˈnä-​di-​kəl \

Definition of synodic 

1 : of or relating to a synod : synodal

2 usually synodic [ Greek synodikos, from synodos meeting, conjunction ] : relating to conjunction especially : relating to the period between two successive conjunctions of the same celestial bodies (such as the moon and the sun)

First Known Use of synodic

1561, in the meaning defined at sense 1

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The first known use of synodic was in 1561

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