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The Collaborative International Dictionary
In her complement

Complement \Com"ple*ment\, n. [L. complementun: cf. F. compl['e]ment. See Complete, v. t., and cf. Compliment.]

  1. That which fills up or completes; the quantity or number required to fill a thing or make it complete.

  2. That which is required to supply a deficiency, or to complete a symmetrical whole.

    History is the complement of poetry.
    --Sir J. Stephen.

  3. Full quantity, number, or amount; a complete set; completeness.

    To exceed his complement and number appointed him which was one hundred and twenty persons.
    --Hakluyt.

  4. (Math.) A second quantity added to a given quantity to make it equal to a third given quantity.

  5. Something added for ornamentation; an accessory. [Obs.]

    Without vain art or curious complements.
    --Spenser.

  6. (Naut.) The whole working force of a vessel.

  7. (Mus.) The interval wanting to complete the octave; -- the fourth is the complement of the fifth, the sixth of the third.

  8. A compliment. [Obs.]
    --Shak.

    Arithmetical compliment of a logarithm. See under Logarithm.

    Arithmetical complement of a number (Math.), the difference between that number and the next higher power of 10; as, 4 is the complement of 6, and 16 of 84.

    Complement of an arc or Complement of an angle (Geom.), the difference between that arc or angle and 90[deg].

    Complement of a parallelogram. (Math.) See Gnomon.

    In her complement (Her.), said of the moon when represented as full.