What is Ancillary?

Legal Definition
Aiding auxiliary; attendant upon; subordinate; a proceeding attendant upon or which aids another proceeding considered as principal. Steele v. Insurance Co., 31 App. Div. 389, 52 N. Y. Supp. 873.
See also
-- Black's Law Dictionary
Legal Definition
That which is subordinate on, or is. subordinate to, some other decision. Encyc. Lond. 1
-- Bouviers Law Dictionary
Legal Definition
Auxiliary.
-- Ballentine's Law Dictionary