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noun
The totality, the full amount or number which completes something.
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noun
(nautical) The whole working force of a vessel.
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noun
(astronomy, geometry) An angle which, together with a given angle, makes a right angle.
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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.
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noun
(grammar, linguistics) 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.
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noun
(palaeography, phonetics) A phonetic complement is a graphic element that modifies another, such as (in Linear B script) a small syllabogram that is attached to a logogram as an abbreviation of its reading (as opposed to an adjunct that abbreviates an adjective that modifies that logogram).
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noun
(music) An interval which, together with the given interval, makes an octave.
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noun
(optics) The color which, when mixed with the given color, gives black (for mixing pigments) or white (for mixing light).