What does LEVEL mean?

noun

1. a position on a scale of intensity or amount or quality“a moderate grade of intelligence”
2. a relative position or degree of value in a graded group“lumber of the highest grade”
3. a specific identifiable position in a continuum or series or especially in a process“a remarkable degree of frankness”
4. height above ground“the water reached ankle level”
5. indicator that establishes the horizontal when a bubble is centered in a tube of liquid
6. a flat surface at right angles to a plumb line“park the car on the level”
7. an abstract place usually conceived as having depth“a good actor communicates on several levels”
8. a structure consisting of a room or set of rooms at a single position along a vertical scale“what level is the office on?”