NISI. This word is frequently used in legal proceedings to denote that something has been done, which is to be valid unless something else Shall be done within a certain time to defeat it. For example, an order may be made that if on the day appointed to show cause, none be shown, an injunction will be dissolved of course, on motion, and production of an affidavit of service of the order. This is called an order nisi. Ch. Pr. 547. Under the compulsory arbitration law of Pennsylvania, on the filing of the award, judgment nisi is to be entered: which judgment is to be as valid as if it had been rendered on the verdict of a jury, unless an appeal be entered within the time required by the law.