ad. Used to indicate that the current citation is from the same source as the previous one.
the GNU version of the Collaborative International Dictionary of English
ad. Over; above; before; also, beyond; besides; -- much used as a prefix.
The Century Dictionary and Cyclopedia
A prefix of Latin origin, meaning ‘above,’ ‘beyond.’
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
ad. at an earlier place
Word Usage
""Statura fuit supra modum humili," etc.] [Footnote 129: Sc. Sammarthani Elog., _ubi supra_.] [Footnote 130: Lefèvre's scientific works were numerous, and some of them passed through many editions during the early years of the sixteenth century."