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2 definitions found
 for Grade crossing
From The Collaborative International Dictionary of English v.0.48 :

  Grade \Grade\ (gr[=a]d), n. [F. grade, L. gradus step, pace,
     grade, from gradi to step, go. Cf. Congress, Degree,
     Gradus.]
     1. A step or degree in any series, rank, quality, order;
        relative position or standing; as, grades of military
        rank; crimes of every grade; grades of flour.
        [1913 Webster]
  
              They also appointed and removed, at their own
              pleasure,
              teachers of every grade.              --Buckle.
        [1913 Webster]
  
     2. In a railroad or highway:
        (a) The rate of ascent or descent; gradient; deviation
            from a level surface to an inclined plane; -- usually
            stated as so many feet per mile, or as one foot rise
            or fall in so many of horizontal distance; as, a heavy
            grade; a grade of twenty feet per mile, or of 1 in
            264.
        (b) A graded ascending, descending, or level portion of a
            road; a gradient.
            [1913 Webster]
  
     3. (Stock Breeding) The result of crossing a native stock
        with some better breed. If the crossbreed have more than
        three fourths of the better blood, it is called high
        grade.
        [1913 Webster]
  
     At grade, on the same level; -- said of the crossing of a
        railroad with another railroad or a highway, when they are
        on the same level at the point of crossing.
  
     Down grade, a descent, as on a graded railroad.
  
     Up grade, an ascent, as on a graded railroad.
  
     Equating for grades. See under Equate.
  
     Grade crossing, a crossing at grade.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  grade crossing
      n 1: intersection of a railway and a road on the same level;
           barriers close road when trains pass [syn: level
           crossing, grade crossing]

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