Complement may refer to:

The arts

  • 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

  • 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

  • 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
  • Object complement, a word or phrase adding to the direct object of a verb phrase.
  • Complementary distribution
  • Phonetic complement
  • Complementary, a type of opposite in lexical semantics (sometimes called an antonym)

Mathematics

Algebra

  • Complement (group theory)
  • Complementary subspaces
  • Orthogonal complement
  • Schur complement

Algorithms

  • 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

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

Geometry

  • Complement of an angle, the difference between a right angle (90 degrees) and a given angle
  • Knot complement
  • Complement of a point, the dilation of a point in the centroid of a given triangle, with ratio −1/2

Logic

  • Complement (set theory)
  • Negation, also known as "logical complement"
  • Bitwise complement

Other uses

  • Complement good (economics), a good often consumed together with another good
  • Ship's complement, the crew

See also

  • Complementarity (disambiguation)
  • Compliment (disambiguation)
  • Complimentary (disambiguation)