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Lowest in importance or rank.
(adjective)
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Smallest in magnitude or degree.
(adjective)
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Slightest or tiniest: didn't care the least bit.
(adjective)
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To or in the lowest or smallest degree.
(adverb)
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One that is the lowest or smallest in importance, rank, magnitude, or degree: The dinner menu is the least of my worries tonight. The least you can do is to be polite.
(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.