At least one pair, or one pair?
If it is one pair, then it depends if the shape is regular or irregular.
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A trapezium (has only one pair of unequal parallel lines).
If you mean one pair of parallel lines, then you're talking about a trapezoid.
A shape that has no pairs of parallel lines is called a trapezoid. In a trapezoid, only one pair of opposite sides are parallel, while the other pair is not. This distinguishes a trapezoid from shapes like rectangles, squares, and parallelograms, which have at least one pair of parallel sides. The properties of a trapezoid make it a unique and interesting geometric shape to study.
TRAPEZOID
A quadrilateral with one pair of parallel lines would be a trapezoid. : P