the GNU version of the Collaborative International Dictionary of English
ad. Without doubt or question; unquestionably.
The Century Dictionary and Cyclopedia
With certainty; without doubt or question; in truth and fact; without fail; inevitably; assuredly; undoubtedly; unquestionably; of a certainty.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
ad. definitely or positively (`sure' is sometimes used informally for `surely')
Word Usage
"The scientific issues were what initially brought me to this debate, but the religious implications are certainly right there in your face as well...and, both subjects are *certainly* interesting."