If a company belongs to another company, then the owned company is a subsidiary. When a large company bought your small business, you became a subsidiary. It still hurts to call them the parent company, since you publish novels and they make toilet paper.

The adjective form of subsidiary describes something that is of secondary importance or that functions in a supporting capacity. In addition to running the band program, you're a member of several subsidiary committees like the fund raising committee and the hospitality committee. Traffic on the road was light when you drove outside the city, but as more subsidiary roads joined with the main one, traffic quickly became congested.

Definitions of subsidiary

adj functioning in a supporting capacity

auxiliary, supplemental, supplementary
being of second rank or importance or value; not direct or immediate

n an assistant subject to the authority or control of another

foot soldier, subordinate, underling
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a person with subordinate membership in a society, institution, or commercial enterprise
bottom dog
a person of low status
a subordinate who performs an important but routine function
a male subordinate
second banana, second fiddle
someone who serves in a subordinate capacity or plays a secondary role
Type of:
assistant, help, helper, supporter
a person who contributes to the fulfillment of a need or furtherance of an effort or purpose

n a company that is completely controlled by another company

subsidiary company
Type of:
an institution created to conduct business

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