1. one

      [ wuhn ]
      / wʌn /

      adjective

      noun

      pronoun

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      Idioms for one

      Origin of one

      before 900; Middle English oon, Old English ān; cognate with Dutch een, German ein, Gothic ains, Latin ūnus (OL oinos); akin to Greek oínē ace on a die

      usage note for one

      One as an indefinite pronoun meaning “any person indefinitely, anyone” is more formal than you, which is also used as an indefinite pronoun with the same sense: One (or you ) should avoid misconceptions. One (or you ) can correct this fault in three ways. When the construction requires that the pronoun be repeated, either one or he or he or she is used; he or he or she is the more common in the United States: Wherever one looks, he (or he or she ) finds evidence of pollution. In speech or informal writing, a form of they sometimes occurs: Can one read this without having their emotions stirred?
      In constructions of the type one of those who (or that or which ), the antecedent of who is considered to be the plural noun or pronoun, correctly followed by a plural verb: He is one of those people who work for the government. Yet the feeling that one is the antecedent is so strong that a singular verb is commonly found in all types of writing: one of those people who works for the government. When one is preceded by only in such a construction, the singular verb is always used: the only one of her sons who visits her in the hospital.
      The substitution of one for I, a typically British use, is usually regarded as an affectation in the United States. See also he1, they.

      WORDS THAT MAY BE CONFUSED WITH one

      one wan won (see usage note at the current entry)

      Definition for one (2 of 2)

      -one

      a suffix used in the names of ketones and analogous chemical compounds: lactone; quinone.

      Origin of -one

      perhaps < Greek -ōnē feminine patronymic
      Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

      Example sentences from the Web for one

      British Dictionary definitions for one (1 of 2)

      one
      / (wʌn) /

      determiner

      pronoun

      noun

      Other words from one

      Related prefixes: mono-, uni-Related adjective: single

      Word Origin for one

      Old English ān, related to Old French ān, ēn, Old High German ein, Old Norse einn, Latin unus, Greek oinē ace

      British Dictionary definitions for one (2 of 2)

      -one

      suffix forming nouns

      indicating that a chemical compound is a ketoneacetone

      Word Origin for -one

      arbitrarily from Greek -ōnē, feminine patronymic suffix, but perhaps influenced by -one in ozone
      Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

      Medical definitions for one

      -one

      suff.

      A ketone:acetone.
      A compound that contains oxygen, especially in a carbonyl radical:lactone.
      The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

      Scientific definitions for one

      -one

      A suffix used to form the names of chemical compounds containing an oxygen atom attached to a carbon atom, such as acetone.
      The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

      Idioms and Phrases with one

      one

      The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
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