vicinal adjective. ['vɪsɪn(ǝ)l, vɪ'sʌɪn(ǝ)l] E17.
[French, or Latin vicinalis, from vicinus (as noun) neighbour, (as adjective) neighbouring: see -AL¹.]
1. Of or pertaining to a neighbour or neighbours; (esp. of a railway or road) serving a neighbourhood, local. E17.

2. Neighbouring, adjacent. M18.
b. Math. & Crystallography. Nearly coincident with a given plane or face. rare. L19.
c. Chemistry. Of substituted groups or atoms: in neighbouring or adjacent positions on a carbon ring or chain. L19.

[TahlilGaran] English Dictionary ▲