A horizontal plane or line with respect to the distance above or below a given point:
the front garden is on a level with this floor
A height or distance from the ground or another stated or understood base:
storms caused river levels to rise
A floor within a multistorey building.
A position on a scale of amount, quantity, extent, or quality:
a high level of unemployment
debt rose to unprecedented levels
An intellectual, social, or moral standard:
at six he could play chess at an advanced level
[MASS NOUN]: women do better at degree level
A position in a hierarchy:
a junior level of management
An instrument marked with a line parallel to the plane of the horizon for testing whether things are horizontal.
3.1 Surveying An instrument for giving a horizontal line of sight.