A more thorough explanation:

Definition: A full cousin is a first cousin, meaning they share a set of grandparents with you.

Example: Your mother's brother's child is your full cousin because you share the same set of grandparents on your mother's side.

Explanation: Full cousins are also known as first cousins because they are the children of your parents' siblings. The term "full" is used to distinguish them from half-cousins, who share only one grandparent with you. The example given shows how a full cousin is related to you through your mother's side of the family.