ABCDEFGHIJKLMNOPQRSTUVWXYZ Definition of Trapezium more ... A flat shape with 4 straight sides NONE of which are parallel. (Called a trapezoid in the UK. Both US and UK definitions of trapezium and trapezoid are swapped over.) See: Trapezoid, Parallel, Quadrilateral Quadrilaterals - Square, Rectangle, Rhombus, Trapezoid, Parallelogram
