• synonyms


[ahy-dem, id-em]
pronoun, adjective
  1. the same as previously given or mentioned.
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Origin of idem

1350–1400; Middle English < Latin īdem
Can be confusedibid. ibidem idem op. cit.

alter idem

[ahl-ter ee-dem; English awl-ter ahy-dem, al-]
noun Latin.
  1. another exactly the same.
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semper idem

[sem-per ee-dem; English sem-per ahy-dem, id-em]
  1. always the same.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for idem

Historical Examples

  • Idem, Proverbs of the Arabs; and my Lexicon, voce "khaṭaba."

    Arabian Society In The Middle Ages

    Edward William Lane

  • Idem, p. 65 (quotations from The Principles of the Revolution).

  • The 18th, idem, but in two shots: two Fritzes in five shots, record.

    Georges Guynemer

    Henry Bordeaux

  • Idem scire is a good thing; but men of all nations may know the same thing, and yet remain strangers one to another.

  • Idem velle idem nolle in re publica, ea demum firma amicitia est.

British Dictionary definitions for idem


  1. the same: used to refer to an article, chapter, etc, previously cited
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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

Word Origin and History for idem

Latin, literally "the same" (see identical).

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semper idem

Latin, literally "always the same;" see semper- + identical.

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Online Etymology Dictionary, © 2010 Douglas Harper