complemental

adj.
Having to do with or being a complement.

complementally com'ple·men'tal·ly adv.

adjective

Forming or serving as a complement: complementary, supplemental. See agree/disagree, part/whole.

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The adjective has one meaning:

Meaning #1: acting as or providing a complement (something that completes the whole)
  Synonyms: complementary, completing

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