Longman Dictionary of Contemporary English homepage

complementary

 adjective
     
Related topics: Maths
com‧ple‧men‧ta‧ry
1 complementary things go well together, although they are usually different:
The computer and the human mind have different but complementary abilities.
2 technical complementary colours of light are very different and combine to make white
3HM technical two angles that are complementary add up to 90 degrees
—complementarity noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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