one
adjective
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eminent beyond or above comparisonnonpareil
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indefinite in time or position
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used informally as an intensifier
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of the same kind or quality
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having the indivisible character of a unitunitary
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being a single entity made by combining separate components“three chemicals combining into one solution”
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used of a single unit or thingiane
noun
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a single person or thing“They are the best one.”
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the smallest whole number or a numeral representing this number“I have the one guitar but I need a second and a third to go with it.”single