com·ple·men·ta·ry

[kom-pluh-men-tuh-ree, -tree] adjective, noun, plural com·ple·men·ta·ries.
adjective
1.
forming a complement; completing.
2.
complementing each other.
noun
3.

Origin:
1590–1600; complement + -ary

com·ple·men·ta·ri·ness, noun
un·com·ple·men·ta·ry, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
complementary or complemental (ˌkɒmplɪˈmɛntərɪ, -trɪ) [Click for IPA pronunciation guide]
 
adj
1.  acting as or forming a complement; completing
2.  forming a satisfactory or balanced whole
3.  forming a mathematical complement: sine and cosine are complementary functions
4.  maths, logic (of a pair of sets, etc) mutually exclusive and exhaustive, each being the complement of the other
5.  (of genes) producing an effect in association with other genes
6.  involving or using the treatments and techniques of complementary medicine
 
complemental or complemental
 
adj
 
comple'mentarily or complemental
 
adv
 
comple'mentally or complemental
 
adv
 
comple'mentariness or complemental
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Complementary is always a great word to know.
So is interrobang. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Etymonline
Word Origin & History

complementary
1829, from complement. Earliest attested use is in complementary colors.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It is now realistic to talk about complementary pressure on the insurgencies on
  both sides of the border.
Mind you this diet is not some complementary humbug, but a strictly medically
  supervised treatment.
When viewed together, the photographers' differing compositions become
  complementary.
Now, thanks to a series of complementary innovations, geneticists have begun
  teasing apart the complexity.
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