of lower or secondary class or rank subordinate, subsidiary.
a person whose work provides necessary support to the primary activities of an organization, institution, or industry [n ANCILLARIES]
is an adjective used in formal speech and writing as a synonym of supplementary to describe things that provide something additional to a main part or function of something else.
Providing necessary support to the primary activities or operation of an organization, institution, industry, or system
Additional; subsidiary
subordinate or subsidiary [adj] / something that functions as an accessory [n ANCILLARIES]