It's Latin: http://humanum.arts.cuhk.edu.hk/Lexis/Latin/
Results for query "monitum":
# monitum : admonition.
I can understand that "a monitum" means "warning" by searching Google, but why can't I find the word in dictionaries?
Latin!!! I never thought of that!
Thank you very much, Tdol.
The contexts in Google seemed mostly related to the Catholic Church, which uses Latin in some contexts.