A trapezoid (or trapezium, outside of North America) has two parallel sides.
The more common definition 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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1 pair of parallel line
A trapezoid has 1 pair of opposite parallel lines of different lengths.
A trapezoid is a quadrilateral with one pair of sides parallel.
Exactly one pair.
A trapezoid has one pair of parallel sides.