Definitions from Wiktionary ( )

▸ noun:  The totality, the full amount or number which completes something.
▸ noun:  (nautical) The whole working force of a vessel.
▸ noun:  (astronomy, geometry) An angle which, together with a given angle, makes a right angle.
▸ noun:  Something which completes, something which combines with something else to make up a complete whole; loosely, something perceived to be a harmonious or desirable partner or addition.
▸ noun:  (grammar, linguistics) A word or group of words that completes a grammatical construction in the predicate and that describes or is identified with the subject or object.
▸ noun:  (music) An interval which, together with the given interval, makes an octave.
▸ noun:  (optics) The color which, when mixed with the given color, gives black (for mixing pigments) or white (for mixing light).
▸ noun:  (set theory) Given two sets, the set containing one set's elements that are not members of the other set (whether a relative complement or an absolute complement).
▸ noun:  (immunology) One of several blood proteins that work with antibodies during an immune response.
▸ noun:  (logic) An expression related to some other expression such that it is true under the same conditions that make other false, and vice versa.
▸ noun:  (electronics) A voltage level with the opposite logical sense to the given one.
▸ noun:  (computing) A bit with the opposite value to the given one; the logical complement of a number.
▸ noun:  (computing, mathematics) The diminished radix complement of a number; the nines' complement of a decimal number; the ones' complement of a binary number.
▸ noun:  (computing, mathematics) The radix complement of a number; the two's complement of a binary number.
▸ noun:  (computing, mathematics) The numeric complement of a number.
▸ noun:  (genetics) A nucleotide sequence in which each base is replaced by the complementary base of the given sequence: adenine (A) by thymine (T) or uracil (U), cytosine (C) by guanine (G), and vice versa.
▸ noun:  (biochemistry) Synonym of alexin
▸ noun:  (now rare) Something (or someone) that completes; the consummation.
▸ noun:  (obsolete) The act of completing something, or the fact of being complete; completion, completeness, fulfilment.
▸ noun:  (obsolete) Something which completes one's equipment, dress etc.; an accessory.
▸ noun:  Obsolete spelling or misspelling of compliment.
▸ verb:  To complete, to bring to perfection, to make whole.
▸ verb:  To provide what the partner lacks and lack what the partner provides, thus forming part of a whole.
▸ verb:  To change a voltage, number, color, etc. to its complement.
▸ noun:  (economics) Abbreviation of complementary good. [(economics) a good whose appeal increases with the popularity of its complement]
▸ verb:  (obsolete) Alternative spelling of compliment [(ambitransitive) To pay a compliment (to someone); to express a favourable opinion (of someone).]

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