The more common definition of a trapezoid (or trapezium, outside of North America) is a four-sided figure with exactly one pair of parallel sides. By this definition, figures with two sets of parallel sides such as a rectangle are nottrapezoids.
Some mathematicians use a more general definition that allows for one or more pair of parallel sides. By this definition, a rectangle, square, or rhombus would be considered as special cases of a trapezoid.
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A trapezoid has one pair of parallel sides.
A trapezoid may have zero or one pair of congruent sides.
Zero
One pair.
A trapezoid is a quadrilateral with one pair of sides parallel.