English to English
1. Furnishing aid; assisting; auxiliary; helping; tributary; especially, aiding in an inferior position or capacity; as, a subsidiary stream.
2. functioning in a supporting capacity
the main library and its auxiliary branches
3. an assistant subject to the authority or control of another
4. a company that is completely controlled by another company
5. One who, or that which, contributes aid or additional supplies; an assistant; an auxiliary.