: real being : existence
: the condition of remaining in existence : continuation, persistence
: an essential characteristic quality of something that exists
: a device for establishing a horizontal line or plane by means of a bubble in a liquid that shows adjustment to the horizontal by movement to the center of a slightly bowed glass tube
: a measurement of the difference of altitude of two points by means of a level
: horizontal condition
: to make (a line or surface) horizontal : make flat or level
: to bring to a horizontal aiming position
: aim, direct
: having no part higher than another : conforming to the curvature of the liquid parts of the earth's surface
: parallel with the plane of the horizon : horizontal
: even or unvarying in height
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