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*n.* That which fills up or completes; the quantity or number required to fill a thing or make it complete. That which is required to supply a deficiency, or to complete a symmetrical whole. Full quantity, number, or amount; a complete set; completeness.

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

- Something added for ornamentation; an accessory.

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

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

- A compliment. 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 angle (Geom.), the difference between that arc or angle and 90°.

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

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

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