Etymology
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ibid. (adv.)

"at the place or in the book already mentioned" (used to avoid repetition of references), 1660s, abbreviation of Latin ibidem "in the same place, just there," from ibi "there," pronominal adverb of place, + demonstrative suffix -dem. Also ibid, but properly with the period.

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Definitions of ibid.

ibid. (adv.)
in the same place (used when citing a reference);
Synonyms: ib. / ibidem
From wordnet.princeton.edu