# Complement

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Not to be confused with [compliment](/source/Compliment_(disambiguation)), an expression of praise.

**Complement** may refer to:

## The arts

- [Complement (music)](/source/Complement_(music)), an interval that, when added to another, spans an octave - [Aggregate complementation](/source/Complement_(music)#Aggregate_complementation), the separation of pitch-class collections into complementary sets
- [Complementary color](/source/Complementary_color), in the visual arts

## Biology and medicine

- [Complement system](/source/Complement_system) (immunology), a cascade of proteins in the blood that form part of innate immunity
- [Complementary DNA](/source/Complementary_DNA), DNA reverse transcribed from a mature mRNA template
- [Complementarity (molecular biology)](/source/Complementarity_(molecular_biology)), a property whereby double stranded nucleic acids pair with each other
- [Complementation (genetics)](/source/Complementation_(genetics)), a test to determine if independent recessive mutant phenotypes are caused by mutations in the same gene or in different genes

## Grammar and linguistics

- [Complement (linguistics)](/source/Complement_(linguistics)), a word or phrase having a particular syntactic role - [Subject complement](/source/Subject_complement), a word or phrase adding to a clause's subject after a linking verb - [Object complement](/source/Object_complement), a word or phrase adding to the direct object of a verb phrase.
- [Complementary distribution](/source/Complementary_distribution)
- [Phonetic complement](/source/Phonetic_complement)
- [Complementary](/source/Opposite_(semantics)#Complementary_antonyms), a type of opposite in lexical semantics (sometimes called an antonym)

## Mathematics

### Algebra

- [Complement (group theory)](/source/Complement_(group_theory))
- [Complementary subspaces](/source/Complementary_subspaces)
- [Orthogonal complement](/source/Orthogonal_complement)
- [Schur complement](/source/Schur_complement)

### Algorithms

- [Complement (complexity)](/source/Complement_(complexity)), relating to decision problems and complexity classes
- [Complement operator (regular expressions)](/source/Complement_operator_(regular_expressions))
- [Method of complements](/source/Method_of_complements), in computer science - Radix complement - Diminished radix complement - [Ones' complement](/source/Ones'_complement) - [Two's complement](/source/Two's_complement)

### Discrete mathematics

- [Complement graph](/source/Complement_graph) - [Self-complementary graph](/source/Self-complementary_graph), a graph which is isomorphic to its complement
- [Complemented lattice](/source/Complemented_lattice)

### Geometry

- [Complement of an angle](/source/Angular_complement), the difference between a right angle (90 degrees) and a given angle
- [Knot complement](/source/Knot_complement)
- Complement of a point, the dilation of a point in the [centroid](/source/Centroid) of a given triangle, with ratio −1/2

### Logic

- [Complement (set theory)](/source/Complement_(set_theory))
- [Negation](/source/Negation), also known as "logical complement"
- [Bitwise complement](/source/Bitwise_complement)

## Other uses

- [Complement good](/source/Complement_good) (economics), a good often consumed together with another good
- [Ship's complement](/source/Ship's_complement), the crew

## See also

- [Complementarity (disambiguation)](/source/Complementarity_(disambiguation))
- [Compliment (disambiguation)](/source/Compliment_(disambiguation))
- [Complimentary (disambiguation)](/source/Complimentary_(disambiguation))

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Adapted from the Wikipedia article [Complement](https://en.wikipedia.org/wiki/Complement) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Complement?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.