Q. What does ibid. mean?

Ibid. is a Latin word, short for ibidem, which means the same place.  It is the term used to provide an endnote or footnote citation or reference for a source that was cited in the preceding endnote or footnote. It is similar in meaning to idem (meaning something that has been mentioned previously; the same), abbreviated Id., which is commonly used in legal citation. To find the ibid. source, one must look at the reference preceding it.