Complement

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Dual-complement-3.jpg

Etymology

Middle English, from Latin complementum, from complēre to fill up, complete, from com- + plēre to fill — more at full

Definitions

  • 1 a : something that fills up, completes, or makes perfect
b : the quantity, number, or assortment required to make a thing complete <the usual complement of eyes and ears — Francis Parkman>; especially : the whole force or personnel of a ship
c : one of two mutually completing parts : counterpart
  • 2 a : the angle or arc that when added to a given angle or arc equals a right angle in measure
b : the set of all elements that do not belong to a given set and are contained in a particular mathematical set containing the given set
c : a number that when added to another number of the same sign yields zero if the significant digit farthest to the left is discarded —used especially in assembly language programming
  • 3 : the musical interval required with a given interval to complete the octave
  • 4 : an added word or expression by which a predication is made complete (as president in “they elected him president” and beautiful in “he thought her beautiful”)
  • 5 : the thermolabile group of proteins in normal blood serum and plasma that in combination with antibodies causes the destruction especially of particulate antigens (as bacteria and foreign blood corpuscles)