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abbreviation for (in annotations, bibliographies, etc, when referring to a book, article, chapter, or page previously cited)
Word Origin for ibid.
Latin: in the same place
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
also ibid, 1660s, abbreviation of Latin ibidem "in the same place," from ibi "there," pronomial adverb of place, + demonstrative suffix -dem.
Online Etymology Dictionary, © 2010 Douglas Harper
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.