English Dictionary

A line or surface to which, at every point, a vertical or plumb line is perpendicular; a line or surface which is everywhere parallel to the surface of still water; -- this is the true level, and is a curve or surface in which all points are equally distant from the center of the earth, or rather would be so if the earth were an exact sphere.
Source : opted (88626)  - auto

A horizontal line or plane; that is, a straight line or a plane which is tangent to a true level at a given point and hence parallel to the horizon at that point; -- this is the apparent level at the given point.
Source : opted (88627)  - auto

An approximately horizontal line or surface at a certain degree of altitude, or distance from the center of the earth; as, to climb from the level of the coast to the level of the plateau and then descend to the level of the valley or of the sea.
Source : opted (88628)  - auto

Hence, figuratively, a certain position, rank, standard, degree, quality, character, etc., conceived of as in one of several planes of different elevation.
Source : opted (88629)  - auto

A uniform or average height; a normal plane or altitude; a condition conformable to natural law or which will secure a level surface; as, moving fluids seek a level.
Source : opted (88630)  - auto

An instrument by which to find a horizontal line, or adjust something with reference to a horizontal line.
Source : opted (88631)  - auto

A measurement of the difference of altitude of two points, by means of a level; as, to take a level.
Source : opted (88632)  - auto

A horizontal passage, drift, or adit, in a mine.
Source : opted (88633)  - auto

Even; flat; having no part higher than another; having, or conforming to, the curvature which belongs to the undisturbed liquid parts of the earth's surface; as, a level field; level ground; the level surface of a pond or lake.
Source : opted (88634)  - auto

Coinciding or parallel with the plane of the horizon; horizontal; as, the telescope is now level.
Source : opted (88635)  - auto