vīsati
Vīsati & vīsaṃ
indeclinable number 20
■ Both forms are used indiscriminately
- vīsati, e.g. Vin.ii.271 (˚vassa, as minimum age of ordination); Snp.457 (catu-vīsat’akkharaṃ); Ja.i.89 (˚sahassa bhikkhū); Ja.iii.360; Vb-a.191 sq.; Dhp-a.i.4 (ekūna˚, 19); Dhp-a.ii.9, Dhp-a.ii.54; Dhp-a.iii.62 (˚sahassa bhikkhū, as followers); as vīsatiṃ at Dhp-a.ii.61 (vassa-sahassāni).
- vīsaṃ; e.g. Snp.1019 (˚vassa-sata); Iti.99 (jātiyo) Ja.i.395 (˚yojana-sata); Ja.v.36 (˚ratana-sata); Dhp-a.i.8 Dhp-a.ii.91 (˚yojana-sataṃ).
both for Vedic viṃśati; cp. Av. vīsaiti, Gr. ει ̓́κοσι, Lat. viginti, Oir. fiche, etc.; fr Idg. *ṷi + komt (decad), thus “two decads.” Cp. vi˚