Complement

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.

A second quantity added to a given quantity to make it equal to a third given quantity.

Something added for ornamentation; an accessory.

The whole working force of a vessel.

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

A compliment.

To supply a lack; to supplement.

To compliment.

either of two parts that mutually complete each other

one of a series of enzymes in the blood serum that are part of the immune response

something added to complete or embellish or make perfect; "a fine wine is a perfect complement to the dinner"; "wild rice was served as an accompaniment to the main dish"

a word or phrase used to complete a grammatical construction