Definition of on a diagonal
- The stone wall cuts across the field on a diagonal.
: joining two vertices of a rectilinear figure that are nonadjacent or two vertices of a polyhedral figure that are not in the same face
: passing through two nonadjacent edges of a polyhedron
: inclined obliquely from a reference line (such as the vertical)
: a diagonal straight line or plane
: a diagonal direction
: a diagonal row, arrangement, or pattern
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