Si Ita Est Law and Legal Definition

Si ita est means if it is true. It is a phrase used in writs of mandamus which issued out of the English court of chancery to compel an inferior court to sign a bill of exceptions, and commanding the judge to seal it, if the fact alleged is truly stated. [Ex parte Crane, 8 L. Ed. 92, 93 (U.S. 1831)].