'Synod' is Greek for 'a coming together on the road' — from 'syn-' + 'hodos' (way).
A council of a church, usually convened to discuss and decide on matters of doctrine, administration, or discipline.
From Late Latin 'synodus,' from Greek 'sýnodos' (σύνοδος: a meeting, an assembly, a conjunction of heavenly bodies, a coming-together on the road), from 'syn-' (together, with) + 'hodós' (way, road, journey). The PIE root of 'hodós' is *sed- (to go, to travel) — cognate with Latin 'cedere' (to go, yield) giving 'secede,' 'proceed,' 'concede.' The PIE root of 'syn-' is *sem- (one, together). A synod is therefore etymologically 'a walking the same road
The word 'synod' shares its second element with 'method' (meta + hodos, 'a way of pursuit'), 'episode' (epi + hodos, 'a coming upon the road'), 'exodus' (ex + hodos, 'a way out'), and 'period' (peri + hodos, 'a going around'). All contain Greek 'hodos' (road, way). A synod is 'a way together,' a method is 'a way after,' an exodus is 'a way out.'