Latin Language

The Friday File: The singular of agenda in Latin is agendum, just like candelabra, stamina, insignia, and trivia have undergone grammatical change to become singular in English. This fate is (regrettably) befalling data and will eventually befall memoranda and strata. Others Latin words like stadium and ultimatum retain their Latin singular form, but rather than pluralizing as stadia and ultimata, as in Latin, have become stadiums and ultimatums in English.