Complement

In many different fields, the complement of X is something that together with X makes a complete whole—something that supplies what X lacks.

Complement may refer to:

Complement (linguistics), a word or phrase having a particular syntactic role
Phonetic complement
Complementary, a type of opposite in lexical semantics (sometimes called an antonym)
Complement (music), an interval that when added to another spans an octave
Aggregate complementation (music), the separation of pitch-class collections into complementary sets
Complementary color, in painting and optics
Complement good, a good often consumed together with another good in economics
Ship's complement, the number of persons in a Ship's Company, including both commissioned officers and crew

Mathematics and physics

Complement has a variety of uses in mathematics:

Complements in Boolean algebra
Knot complement
Logical complement
Bitwise complement
Orthogonal complement
Method of complements, a method to compute addition and subtraction in mathematics
Complemented lattice
Schur complement
Complement of a point, the dilation of a point in the centroid of a given triangle, with ratio −1/2
Complementary experiments, in physics
Complement, binary representations of negative values in computer science
- Ones' complement
- Two's complement

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