noun
a river or stream flowing into a larger river or lake
adjective
of or relating to a tributary
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The Amazon River has many tributaries that flow into it.
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There are a bunch of smaller rivers that feed into the Amazon, they're called tributaries.
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The Amazon River's got all these little side streams that join up with it, they're like its tributaries or something.
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In the world of finance, a successful business can have many tributaries of income flowing into it.