Lewis & Short

Kălendālis or Kălendāris, e, adj. [Kalendae], of or belonging to the Kalends; of or belonging to the first day of the month: tributa Kalendalia, which fall due on the Kalends, Just. Edict. 13: Juno Kalendaris, to whom worship is paid on the Kalends, Macr. S. 1, 15, 18.