[nahy-sahy, nee-see] 
| not yet final or absolute (used, esp. in law, to indicate that a judgment or decree will become final on a particular date unless set aside or invalidated by certain specified contingencies): a decree nisi. |
| ni·si (nī'sī') adj. Law Taking effect at a specified date unless cause is shown for modification or nullification: a decree nisi. [Latin, unless; see ne in Indo-European roots.] |