from
Bouvier's Law Dictionary, Revised 6th Ed (1856)
JURAMENTUM JUDICIALE. A term in the civil law. The oath called juramentum
judiciale is that which the judge, of his own accord, defers to either of
the parties.
2. It is of two kinds. 1st. That which the judge defers for the
decision of the cause, and which is understood by the general name
juramentum judiciale, and is sometimes called suppletory oath, juramentum
suppletorium.
3.-2d. That which the judge defers in order to fix and determine the
amount of the condemnation which he ought to pronounce, and which is called
juramentum in litem. Poth. on Oblig. P. 4, s. 3, art. 3.