Astronomy. pertaining to a conjunction, or to two successive conjunctions of the same bodies.
of or pertaining to a synod; synodal.
Also, synodical.

1555–65; < Late Latin synodicus < Greek synodikós. See synod, -ic

synodically, adverb
nonsynodic, adjective
nonsynodical, adjective
nonsynodically, adverb
subsynodic, adjective
subsynodical, adjective
subsynodically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
synod (ˈsɪnəd, ˈsɪnɒd)
a local or special ecclesiastical council, esp of a diocese, formally convened to discuss ecclesiastical affairs
[C14: from Late Latin synodus, from Greek sunodos, from syn- + hodos a way]

synodic (sɪˈnɒdɪk)
relating to or involving a conjunction or two successive conjunctions of the same star, planet, or satellite: the synodic month

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
synodic   (sĭ-nŏd'ĭk)  Pronunciation Key 
Relating to the conjunction of celestial bodies, especially to the interval between two successive conjunctions of a planet or the Moon with the Sun as viewed from Earth. For example, the new moon comes at the conjunction of the Moon with the Sun; the interval between successive new moons (the time it takes for the Moon to orbit the Earth and return to conjunction with the Sun) is the Moon's synodic period, also called a lunar month. Synodic time differs from sidereal time, which is measured in relation to the stars and is generally more appropriate to astronomical observation.
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