Webster's English Dictionary

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tributary

1. trib.u.tary \'trib-y*-.ter-e-\ aj 1: paying tribute to another to 
   acknowledge submission, to obtain protecti on, or to purchase peace : 
   SUBJECT 2: paid or owed as tribute  3: channeling supplies into something 
   more inclusive : CONTRIBUTORYM
2. tributary n 1: a ruler or state that pays tribute to a conqueror  2: a 
   stream feeding a larger stream or a lake