What is Billa Vera?

Legal Definition
Practice. When the proceedings of the courts were recorded in Latin, and the grand jury found a bill of indictment to be supported by the evidence, they endorsed on it billa vera; now they indorse in plain English " a true bill."
-- Bouviers Law Dictionary
Legal Definition
(A true bill) In old practice. The endorsement anciently made on a bili of indictment by a grand jury, when they found it sufficiently sustained by evidence. 4 Bl. Comm. 306.
-- Black's Law Dictionary
Legal Definition
-- Ballentine's Law Dictionary