lacuna
Pronunciation:
/ləˈkjuː.nə//ləˈkjuː.nə/noun
Definitions
A small opening; a small pit or depression.
A small blank space; a gap or vacancy; a hiatus.
An absent part, especially in a book or other piece of writing, often referring to an ancient manuscript or similar.
Example: Long lacunae in this inscription make interpretation difficult.
Any gap, break, hole, or lack in a set of things; something missing.