level surface

from The Collaborative International Dictionary of English v.0.48
Level \Lev"el\ (l[e^]v"[e^]l), a.
   1. 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.
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            Ample spaces o'er the smooth
            And level pavement.                   --Milton.
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   2. Coinciding or parallel with the plane of the horizon;
      horizontal; as, the telescope is now level.
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   3. Even with anything else; of the same height; on the same
      line or plane; on the same footing; of equal importance;
      -- followed by with, sometimes by to.
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            Young boys and girls
            Are level now with men; the odds is gone. --Shak.
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            Everything lies level to our wish.    --Shak.
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   4. Straightforward; direct; clear; open.
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            A very plain and level account.       --M. Arnold.
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   5. Well balanced; even; just; steady; impartial; as, a level
      head; a level understanding. [Colloq.] " A level
      consideration." --Shak.
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   6. (Phonetics) Of even tone; without rising or falling
      inflection. --H. Sweet.
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   {Level line} (Shipbuilding), the outline of a section which
      is horizontal crosswise, and parallel with the rabbet of
      the keel lengthwise.

   {Level surface} (Physics), an equipotential surface at right
      angles at every point to the lines of force.
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