What is the meaning of Trapezium?

A quadrilateral with two sides parallel.

A quadrilateral with two sides parallel and two sides non-parallel.

A four-sided polygon with no parallel sides and no sides equal; a simple convex irregular quadrilateral.

The trapezium bone of the wrist.

A region on the ventral side of the brain, either just back of the pons Varolii, or, as in man, covered by the posterior extension of its transverse fibers.

a trapezium, trapezoid, a quadrilateral with two sides parallel

trapezium, trapezoid (four-sided shape with no sides parallel and no equal sides)

Source: wiktionary.org