Complement
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.