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The Collaborative International Dictionary
Synodic

Synodic \Syn*od"ic\, Synodical \Syn*od"ic*al\, a. [L. synodicus, Gr. ?: cf. F. synodique.]

  1. (Eccl.) Of or pertaining to a synod; transacted in, or authorized by, a synod; as, synodical proceedings or forms. ``A synodical epistle.''
    --Bp. Stillingfleet.

  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 (see Lunar month, under Month); the synodical revolution of the moon or a planet.

Douglas Harper's Etymology Dictionary
synodic

1630s, from Late Latin synodicus, from Greek synodikos, from synodos (see synod). Related: Synodical (1560s).

Wiktionary
synodic

a. 1 of, related to or produced by a synod; synodal 2 (context astronomy English) Of or pertaining to the conjunction of two or more heavenly bodies

WordNet

Usage examples of "synodic".

So they set up a flight plan for one synodic period later, muttering something about perturbation corrections.

A ten-hour orbit makes for a fourteen-and-a-half-hour synodic period at synch radius.

On the other hand, the exact time of a synodic revolution of the moon is 29.

That hundred and twenty days is the synodic period of Mercurythe length of time it takes that planet to catch the Earth up on successive trips around the sun.