What does the word noctum mean?

"Nocturn" is not a standalone word in Latin. The word you're likely thinking of is "noctum", which is the genitive plural form of "nox", meaning "night".

So, "noctum" means "of nights" or "of the nights". It's used in phrases like:

* "Somnus noctum" (Sleep of the nights)

* "Silentium noctum" (Silence of the nights)

However, it's worth noting that "noctum" is rarely used in modern Latin as it's considered an older, more archaic form.

If you're seeing this word in a particular context, it might be helpful to provide more information so I can better understand the meaning.