Dictionary Definition:
Mona (nt.) [fr. muni, equal to *maunya taken by Nd as root of moneyya] wisdom, character, self -- possession Sn 540 (˚patha=ñāṇa -- patha SnA 435), 718, 723; Nd1 57; Nd2 514 A (=ñāṇa & paññā); Th 1, 168 (what is monissaŋ? fut. 1st sg. of ?).