A more thorough explanation:

Definition: ELL (el) is a historical unit of measurement for length that corresponds to the modern yard.

Example: In medieval England, cloth was often measured in ells. A piece of cloth that was one ell long would be the same length as one yard today.

Explanation: The example illustrates how the ELL was used as a unit of measurement for cloth in medieval England. It shows that one ell was equivalent to one yard, which is the modern-day equivalent of the ELL.