feminine
Ubbāhikā (feminine) [original feminine of ubbāhika, adjective from ubbāheti in abstract use] — a method of deciding on the expulsion of a bhikkhu, always in instrumental ubbāhikāya "by means of a referendum", the settlement of a dispute being laid in the hands of certain chosen brethren (see Vinaya Texts III 49 f. ) Vin II 95, 97, 305; V 139, 197; A V 71; Mhv 4, 46.
the reference (of a dispute) to a committee of selected bhikkhus
(fem, fem, from ubbāha) select committee; jury; special counsel reference (of a dispute) to a committee of selected bhikkhus [lit.] carrying up Construction: ud + √vah > vāh + *a + ikā ubbāha + ikā