moot point

Noun

Singular moot point

Plural moot points

1. An issue that is subject to, or open for discussion or debate; originally, one to be definitively determined by an assembly of the people.
2. (US) An issue regarded as debatable, but no longer practical.

   Until we rebuild downtown, whether we build more parking spaces is a moot point.

Usage notes

• The first usage given above is used in the UK.
• The second usage given is used in the US