three
Americannoun
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a cardinal number, 2 plus 1.
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a symbol for this number, as 3 or III.
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a set of this many persons or things.
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a playing card, die face, or half of a domino face with three pips.
adjective
idioms
noun
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the cardinal number that is the sum of two and one and is a prime number See also number
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a numeral, 3, III, (iii), representing this number
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the amount or quantity that is one greater than two
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something representing, represented by, or consisting of three units such as a playing card with three symbols on it
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Also called: three o'clock. three hours after noon or midnight
determiner
Etymology
Origin of three
First recorded before 900; Middle English; Old English thrēo, thrīo, feminine and neuter of thrī(e); cognate with Dutch drie, German drei, Old Norse thrīr, Gothic threis, Greek treîs, Latin trēs “three,” ter “thrice,” Irish trí, Old Church Slavonic tri, Sanskrit trī, tráyas
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Research led by Jesse Dixon, MD, PhD, explores how DNA is arranged in three dimensions inside cells, revealing that problems with this structure can lead to cancer and developmental conditions, including autism-related disorders.
From Science Daily
Current lab methods typically take two to three days to provide the same information.
From Science Daily
In brain organoids, which are miniature three dimensional models of brain tissue, sildenafil promoted nerve cell growth.
From Science Daily
Instead, organic material and minerals are grouped into three clearly different chemical regions.
From Science Daily
This part of the journey will last approximately three or four days, punctuated by re-entry into the atmosphere -- one of the mission's most delicate maneuvers.
From Barron's
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.