If it has only one pair of parallel sides and not two, then it's not a parallelogram.
It's a trapezium (trapezoid).
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A trapezoid has exactly one pair of parallel lines
a trapezium
No, a rhombus always has two pairs of parallel lines
A trapezoid (USA) known as a trapezium (UK) has one pair of sides parallel.
A quadrilateral with only one pair of parallel lines is called a trapezoid.