sublevel

plural sublevels

1. An intermediate level between others in a mine
2. An underground level of a building.

   1 more example

   When they completed their sweep of the fourth sublevel, they had to exit the office and walk across the parking garage to catch a different elevator to the rest of the building. Sublevels three through one were all parking lots, giving the appearance to those above that there was nothing further below.

   2020, Andre Gonzalez, Followed East

3. natural sciencesA subshell
4. video gamesA level making up part of a larger level.

1. not comparablemathematicsHaving a lesser constant value than a related level set