In Categorical Logic the term ‘distribution’ is used to designate wether or not a term in a categorical proposition is referring to all the members of that category.

For example, in the Universal Affirmative statement “All cats are mammals”, the subject term (cats) is distributed since we are asserting that every member of the class of cats is also a member of the class of mammals. However, the predicate term (mammals) is NOT distributed in this proposition since we are not making a claim about all mammals, only all cats.