sublevel

From sub- + level.

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sublevel (plural sublevels)

1. An intermediate level between others in a mine
2. An underground level of a building.
   • 2020, Andre Gonzalez, Followed East:

     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. (physics) A subshell
4. (video games) A level making up part of a larger level.

sublevel (not comparable)

1. (mathematics) Having a lesser constant value than a related level set