Banc \Banc\, Bancus \Ban"cus\, Bank \Bank\, n. [OF. banc, LL. bancus. See Bank, n.]

A bench; a high seat, or seat of distinction or judgment; a tribunal or court.

In banc, In banco (the ablative of bancus), In bank, in full court, or with full judicial authority; as, sittings in banc (distinguished from sittings at nisi prius).

Source: Webster's Revised Unabridged Dictionary (1913)