subsidiary

Short definition from Wiktionary

Adjective

1. 1
   Auxiliary or supplemental.
2. 2
   Secondary or subordinate.
3. 3
   Of or relating to a subsidy.

Noun

1. 1
   A company owned by a parent company or a holding company, also called daughter company or sister company.
2. 2
   A subordinate theme.
3. 3
   One who aids or supplies; an assistant.