adjective
acting as or providing a complement (something that completes the whole)
• Syn: ↑complemental, ↑complementary
• Similar to: ↑additive
• Derivationally related forms: ↑complement (for: ↑complementary), ↑complementarity (for: ↑complementary), ↑complement (for: ↑complemental)
Useful english dictionary. 2012.