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Having to do with or being a complement.

com′ple·men′tal·ly adv.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.complemental - acting as or providing a complement (something that completes the whole)
additive - characterized or produced by addition; "an additive process"


Forming or serving as a complement:
References in classic literature ?
But in some genera the larvae become developed either into hermaphrodites having the ordinary structure, or into what I have called complemental males: and in the latter, the development has assuredly been retrograde; for the male is a mere sack, which lives for a short time, and is destitute of mouth, stomach, or other organ of importance, excepting for reproduction.
In response, Prime Minister Netanyahu stated that he would like to further develop the bilateral relationship, which is complemental to each other.
Chelonobia patula (Ranzani), a pointer to the evolution of the complemental male.