He who or that which determines (in various senses of the verb); a determiner.

A determining factor or agent; a ruling antecedent, a conditioning element; a defining word or element.

He who or that which determines, in various senses. That which decides the course of action, or determines the result.

A determinative agent; that which determines, decides, or impels in a given direction.

Each of a number of factors which jointly determine the nature or outcome of something.