lacuna

noun

1. 1

   A small opening; a small pit or depression.

2. 2

   A small blank space; a gap or vacancy; a hiatus.

3. 3

   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.”

4. 4

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

5. 5

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

6. 6

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