complemental

adjective
com·ple·men·tal | \ˌkäm-plə-ˈmen-tᵊl \

Definition of complemental 

1 : relating to or being a complement

2 obsolete : ceremonious, complimentary

First Known Use of complemental

1597, in the meaning defined at sense 1

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The first known use of complemental was in 1597

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