01 a. Furnishing aid; assisting; auxiliary; helping; tributary; especially, aiding in an inferior position or capacity; as, a subsidiary stream.
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1.
Furnishing aid; assisting; auxiliary; helping; tributary; especially, aiding in an inferior position or capacity; as, a subsidiary stream.“Chief ruler and principal head everywhere, not suffragant and subsidiary.” — Florio.“They constituted a useful subsidiary testimony of another state of existence.” — Coleridge.
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2.
Of or pertaining to a subsidy; constituting a subsidy; being a part of, or of the nature of, a subsidy; as, subsidiary payments to an ally.“George the Second relied on his subsidiary treaties.” — Ld. Mahon.