Looking up...
A space or opening that separates two objects, parts, or periods of time.
The fence had a small gap where the dog could slip through.
A narrow opening allowed the dog to escape.
There is a noticeable gap in the data for the year 2020.
Missing information creates an empty spot for that year.
Often used metaphorically to describe a missing element, such as a knowledge gap or salary gap.
Say 'a gap in the fence' for a missing part, but 'a gap between the fence and the wall' for a space separating two things.
Use 'gap' alone for a physical opening, 'gap in' for missing content, and 'gap between' for a space separating two items.
From Old Norse 'gap' meaning 'chasm, opening', related to Old English 'geap' and German 'Gappe'.
Use 'gap' with 'in' for abstract missing parts (e.g., 'gap in knowledge') and with 'between' for physical separations (e.g., 'gap between walls').