[ahy-dem, id-em]

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.

semper idem

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

Examples from the Web for idem

Historical Examples of idem

British Dictionary definitions for idem


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

semper idem

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

Online Etymology Dictionary, © 2010 Douglas Harper