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3 definitions found
 for Water level
From The Collaborative International Dictionary of English v.0.48 :

  Level \Lev"el\ (l[e^]v"[e^]l), n. [OE. level, livel, OF. livel,
     F. niveau, fr. L. libella level, water level, a plumb level,
     dim. of libra pound, measure for liquids, balance, water
     poise, level. Cf. Librate, Libella.]
     1. 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.
        [1913 Webster]
     2. 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.
        [1913 Webster]
     3. 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.
        [1913 Webster]
              After draining of the level in Northamptonshire.
                                                    --Sir M. Hale.
        [1913 Webster]
              Shot from the deadly level of a gun.  --Shak.
        [1913 Webster]
     4. Hence, figuratively, a certain position, rank, standard,
        degree, quality, character, etc., conceived of as in one
        of several planes of different elevation.
        [1913 Webster]
              Providence, for the most part, sets us on a level.
        [1913 Webster]
              Somebody there of his own level.      --Swift.
        [1913 Webster]
              Be the fair level of thy actions laid
              As temperance wills and prudence may persuade.
        [1913 Webster]
     5. 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.
        [1913 Webster]
              When merit shall find its level.      --F. W.
        [1913 Webster]
     6. (Mech. & Surv.)
        (a) An instrument by which to find a horizontal line, or
            adjust something with reference to a horizontal line.
        (b) A measurement of the difference of altitude of two
            points, by means of a level; as, to take a level.
            [1913 Webster]
     7. A horizontal passage, drift, or adit, in a mine.
        [1913 Webster]
     Air level, a spirit level. See Spirit level (below).
     Box level, a spirit level in which a glass-covered box is
        used instead of a tube.
     Carpenter's level, Mason's level, either the plumb level
        or a straight bar of wood, in which is imbedded a small
        spirit level.
     Level of the sea, the imaginary level from which heights
        and depths are calculated, taken at a mean distance
        between high and low water.
     Line of levels, a connected series of measurements, by
        means of a level, along a given line, as of a railroad, to
        ascertain the profile of the ground.
     Plumb level, one in which a horizontal bar is placed in
        true position by means of a plumb line, to which it is at
        right angles.
     Spirit level, one in which the adjustment to the horizon is
        shown by the position of a bubble in alcohol or ether
        contained in a nearly horizontal glass tube, or a circular
        box with a glass cover.
     Surveyor's level, a telescope, with a spirit level
        attached, and with suitable screws, etc., for accurate
        adjustment, the whole mounted on a tripod, for use in
        leveling; -- called also leveling instrument.
     Water level, an instrument to show the level by means of
        the surface of water in a trough, or in upright tubes
        connected by a pipe.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Water level \Wa"ter lev"el\
     1. The level formed by the surface of still water.
        [1913 Webster]
     2. A kind of leveling instrument. See under Level, n.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  water level
      n 1: the level of the surface of a body of water
      2: underground surface below which the ground is wholly
         saturated with water; "spring rains had raised the water
         table" [syn: water table, water level, groundwater
      3: a line corresponding to the surface of the water when the
         vessel is afloat on an even keel; often painted on the hull
         of a ship [syn: waterline, water line, water level]
      4: a water gauge that shows the level by showing the surface of
         the water in a trough or U-shaped tube

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