A trapezium (most of the world) or a trapezoid (US).
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A quadrilateral that has only one pair of parallel sides (the other pair not parallel) is a trapezium.
Yes, a trapezoid is a quadrilateral with only one pair of parallel sides.
A trapezoid
There is no quadrilateral on that list that has only 1 pair of parallel sides.
The trapezoid (UK trapezium) has only 1 pair of unequal parallel sides.