Nundinal

a. [Lat. nundinalis, nundinarius, from nundinæ, the market-day, the weekly market, properly the ninth day, from nundinus, belonging to nine days, from novem, nine, and dies, day; Fr. nundinal.] Pertaining to a fair, or to a market day.

Nundinal letter, among the Romans, one of the first eight letters of the alphabet, which were repeated successively from the first to the last day of the year. One of these always expressed the market day, which returned every nine days.