Subordinate: 1. the lesser order or importance, 2. under the authority or control of another; (a subordinate functionary). 3. a person or thing that is subordinate. 4. to put in a lower rank or position. 5. to make subservient.
Ref: Collins English Dictionary. Third Edition circa 1991.
Given my Dictionary is hopelessly out of date and obviously not to be relied upon for accuracy I concede illiteracy on the understanding that the "real" and "legal" definition be applied by someone so articulate, as yourself perhaps, (or Sir Humphrey), for us mortals not privy to the legal phraseology.
But I'm not a Lawyer. (yellow smilie with band aid over mouth).