A quadrilateral with at least one pair of parallel sides has multiple possible names, depending on what type of quadrilateral it is.
Square
Rectangle
Parallelogram
Rhomboid
Trapezoid
You are probably looking for only one pair of parallel sides, which is a trapezoid - both regular and irregular.
Trapezoids have only one pair of parallel sides.
rectagle ONE pair of parallel sides would be a trapezium or a trapezoid.
Every quadrilateral that is a standard square, rectangle, or parallelogram has at least ONE pair of parallel sides - and they all have two pairs of parallel sides. For only ONE pair of parallel sides, you need an irregular trapezoid.
A trapezium.
A trapezium (most of the world) or a trapezoid (US).
RHOMBOID
A kite, for example. But the general quadrilateral, with no specific name, also has no parallel sides.
A quadrilateral that has only one pair of parallel sides (the other pair not parallel) is a trapezium.
Parallelogram.
It is a trapezoid that has only 1 pair of parallel sides of different lengths
A quadrilateral has four sides that may or may not be equal or parallel If two sides are parallel and the other sides equal but not parallel it is a trapezoid
A trapezium.
British definition differs with USAUSATrapezoidA quadrilateral with one pair of parallel sidesTrapeziumA quadrilateral with no sides parallelBritishTrapezoidA quadrilateral with no sides parallelTrapeziumA quadrilateral with one pair of parallel sides
One pair? If it is one pair of parallel sides, then it is a trapezoid. If it has 2 pairs of parallel sides, then it is a parallelogram.
rhombus
trapezoidA trapezoid has one pair of parallel sides.
A trapezium.