the GNU version of the Collaborative International Dictionary of English
ad. By way of retrospect.
The Century Dictionary and Cyclopedia
In retrospect; with reference to or with reflection upon the past; in law, ex post facto.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
ad. in a manner contemplative of past events
Word Usage
"In fact, if I'm deluding myself at all, I would bet that it's in retrospectively enjoying a performance more — my tendency is to store away the good parts of a concert, and let the mediocre moments fade from memory."