The American Heritage® Dictionary of the English Language, 4th Edition
ad. In conformity with an ideal; perfectly.
ad. In theory or imagination; theoretically.
the GNU version of the Collaborative International Dictionary of English
ad. In an ideal manner; by means of ideals; mentally.
The Century Dictionary and Cyclopedia
In idea; in thought.
According to an ideal.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
ad. in an ideal manner
Word Usage
"Before you purchase a full size snooker table for your home, be sure you have enough space; the minimum space required ideally is 22 foot long and 16 foot wide to allow for cueing all around the table."