thirteenth

thirteenth
adj.
P. τρισκαιδέκατος.

THIRTEENTH

tertius decimus: decimus et tertius (☞ rarely decimus tertius Gell. 18 2 extr.; never tertius et decimus). For the thirteenth time *tertium decimum.

thirteenth: tertius decimus (not decimus tertius), Prisc. Fig. Num. 5 Tac. The men of the t. legion, tertiadecimani, id. H. 3, 27.

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appearing fewer than 50 times

τρεισκαιδέκατος
thirteenth

Idus
...the month (the fifteenth day of March, May, July, and October; the thirteenth of every other month)

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appearing fewer than 50 times

tertius2
ord. adj., the thirteenth