**Com"ple*ment** (?), n. [L. *complementum*: cf. F. *complĂ©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 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 ∨ 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.

© Webster 1913.

**Com"ple*ment** (?), v. t.

**1.**

To supply a lack; to supplement.

[R.]

**2.**

To compliment.

[Obs.]

*Jer. Taylor.*

© Webster 1913.