# Complement

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*or***complement***in Wiktionary, the free dictionary.***complementary****Complement** may refer to:

## The arts[edit]

- Complement (music), an interval that, when added to another, spans an octave
- Aggregate complementation, the separation of pitch-class collections into complementary sets

- Complementary color, in the visual arts

## Biology and medicine[edit]

- Complement system (immunology), a cascade of proteins in the blood that form part of innate immunity
- Complementary DNA, DNA reverse transcribed from a mature mRNA template
- Complementarity (molecular biology), a property whereby double stranded nucleic acids pair with each other
- 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[edit]

- Complement (linguistics), a word or phrase having a particular syntactic role
- Subject complement, a word or phrase adding to a clause's subject after a linking verb

- Phonetic complement
- Complementary, a type of opposite in lexical semantics (sometimes called an antonym)

## Mathematics[edit]

### Algebra[edit]

### Algorithms[edit]

- Complement (complexity), relating to decision problems and complexity classes
- Complement operator (regular expressions)
- Method of complements, in computer science
- Radix complement
- Diminished radix complement
- Ones' complement
- Two's complement

### Discrete mathematics[edit]

- Complement graph
- Self-complementary graph, a graph which is isomorphic to its complement

- Complemented lattice

### Geometry[edit]

- Complementary angles
- Knot complement
- Complement of a point, the dilation of a point in the centroid of a given triangle, with ratio −1/2

### Logic[edit]

- Complement (set theory)
- Complementary event in probability
- Logical complement
- Bitwise complement
- Complements in boolean algebra

## Other uses[edit]

- Complementary experiments, in physics

- Complement good (economics), a good often consumed together with another good
- Ship's complement, the number of persons in a ship's company