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The Collaborative International Dictionary of English v.0.48:

Tributary \Trib"u*ta*ry\, n.; pl. Tributaries. 1. A ruler or state that pays tribute, or a stated sum, to a conquering power, for the purpose of securing peace and protection, or as an acknowledgment of submission, or for the purchase of security. [1913 Webster] 2. A stream or river flowing into a larger river or into a lake; an affluent. [1913 Webster]