Webster's English Dictionary

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complementary

com.ple.men.ta.ry \.ka:m-pl*-'ment-*-re-, -'men-tre-\ aj 1: serving to fill 
   out or complete  2: mutually supplying each other's lack  3: relating to or 
   constituting one of a pair of contrasting colors that pr oduce a neutral 
   color when combined in suitable proportions - complementary n