A more thorough explanation:

Definition: Ulnage (pronounced "uhl-nij") is another term for alnage, which refers to the collection of taxes on woolen cloth. An alnager (pronounced "al-nuh-jer") was a royal official responsible for collecting these taxes.

Example: In medieval England, the alnager would measure the length and width of a piece of woolen cloth and then apply a tax based on its size and quality.

Explanation: The example illustrates how the alnager would use ulnage to determine the amount of tax owed on a piece of woolen cloth. By measuring the dimensions of the cloth, the alnager could calculate the tax owed based on a set rate. This tax was an important source of revenue for the English crown, and the alnager played a key role in its collection.