undesexagesimus

• (Classical) IPA^(key): /uːn.deː.sek.saːˈɡeː.si.mus/, [uːn̪d̪eːs̠ɛks̠äːˈɡeːs̠ɪmʊs̠]
• (modern Italianate Ecclesiastical) IPA^(key): /un.de.sek.saˈd͡ʒe.si.mus/, [un̪d̪es̬eɡzäˈd͡ʒɛːs̬imus]

ūndēsexāgēsimus (feminine ūndēsexāgēsima, neuter ūndēsexāgēsimum); first/second-declension numeral

1. fifty-ninth
   • 238 CE, Censorinus, De die natali XIX:

     Philolaus annum naturalem dies habere prodidit CCCLXIIII et dimidiatum, Aphrodisius CCCLXV et partem diei octavam, Callippus autem CCCLXV, et Aristarchus Samius tantumdem et praeterea die partem MDCXXIII, Meton vero CCCLXV et dierum quinque undevicensimam partem, Oenopides CCCLXV et dierum duum et viginti partem undesexagensimam, Harpalus autem CCCLXV et horas aequinoctiales XIII, at noster Ennius CCCLXVI.

     Philolaus gives to the natural year 364½ days; Aphrodisius, 365⅛ days; Calippus, 365 days; while Aristarchus of Samos adds the 1623rd part of a day. It has, according to Meton, 365 days and the 19th part of 5 days; according to Oenopides it has 365 days, plus the 59th part of 22 days; Harpalus has made it 365 days and 13 equinoxial hours; while our Ennius has given it 366 days.

First/second-declension adjective.