the GNU version of the Collaborative International Dictionary of English
ad. In the manner of an adverb.
The Century Dictionary and Cyclopedia
In the manner or with the force or character of an adverb; as an adverb.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
ad. as an adverb
Word Usage
"Given this account of the intentionality of perception, sensations are best understood adverbially, that is, as a way of perceiving objects in the world."