A Quick and Simple Dictionary

complement

1. Noun.  (context, now) Something (or someone) that completes; the consummation. (defdate, from 14th c.) .
2. Noun.  (obsolete) The act of completing something, or the fact of being complete; completion, completeness, fulfilment. (defdate, 15th-18th c.) .
3. Noun.  The totality, the full amount or number which completes something. (defdate, from 16th c.) .
4. Noun.  (obsolete) Something which completes one's equipment, dress etc.; an accessory. (defdate, 16th-17th c.) .
5. Noun.  (heraldry) Fullness (of the moon). (defdate, from 17th c.) .
6. Noun.  (astronomy, geometry) An angle which, together with a given angle, makes a right angle. (defdate, from 18th c.) .
7. 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. (defdate, from 19th c.) .
8. Noun.  (grammar) 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. (defdate, from 19th c.) .
9. Noun.  (music) An interval which, together with the given interval, makes an octave. (defdate, from 19th c.) .
10. Noun.  (optics) The color which, when mixed with the given color, gives black (for mixing pigments) or white (for mixing light). (defdate, from 19th c.) .
11. 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). (defdate, from 20th c.) .
12. Noun.  (immunology) One of several blood proteins that work with antibodies during an immune response. (defdate, from 20th c.) .
13. 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. (defdate, from 20th c.) .
14. Noun.  (electronics) A voltage level with the opposite logical sense to the given one.
15. Noun.  (computing) A bit with the opposite value to the given one; the logical complement of a number.
16. Noun.  (computing, mathematics) The diminished radix complement of a number; the nines' complement of a decimal number; the ones' complement of a binary number.
17. Noun.  (computing, mathematics) The radix complement of a number; the two's complement of a binary number.
18. Noun.  (computing, mathematics) The numeric complement of a number.
19. 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.
20. Noun.  (obsolete spelling of, compliment) .
21. Verb.  To complete, to bring to perfection, to make whole.
22. Verb.  To provide what the partner lacks and lack what the partner provides.
23. Verb.  To change a voltage, number, color, etc. to its complement.