-न्यायः the rule that at a सत्र, which is performed by several स्वामिन्s together, a प्रतिनिधि is admissible for a स्वामिन् if and when one of the स्वामिन्s commencing the सत्र is lost or dead before the completion of the सत्र. This is discussed and established by Jaimini and Śabara at MS.6.3.22.
Source: Apte
Monier-Williams
Monier Monier-Williams, A Sanskrit–English Dictionary