sublevel

noun

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

   “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.”

3. A subshell
4. A level making up part of a larger level.

adj

1. (not-comparable)Having a lesser constant value than a related level set