the GNU version of the Collaborative International Dictionary of English
ad. In confidence; in reliance on secrecy.
The Century Dictionary and Cyclopedia
In a confidential manner; in reliance on secrecy: as, to tell a person something confidentially.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
ad. in a confidential manner
Word Usage
"Also, they are worried about regulators 'ability to maintain confidentially of any trade secrets divulged, according to testimony that insurers and trade groups have submitted in advance."