sўnŏdĭcus
a, um, adj.
I.
going or coming together, synodical: luna, i. e. when in conjunction with the sun, Firm. Math. 3, 6; 4 praef. fin.—
II.
According to the decrees of the synod, Cassiod. Hist. Eccl. 4, 21; 9, 13.—Hence, adv.: sўnŏdĭcē, in accordance with the synod's decrees, Cassiod. Hist. Eccl. 4, 25.