lacuna

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.

“Long lacunae in this inscription make interpretation difficult.”

Any gap, break, hole, or lack in a set of things; something missing.

A space visible between cells, allowing free passage of light.

A language gap, which occurs when there is no direct translation in the target language for a lexical term found in the source language.