the GNU version of the Collaborative International Dictionary of English
ad. In a canonical manner; according to the canons.
The Century Dictionary and Cyclopedia
In conformity with a canon or rule; specifically, in conformity with, or in the manner prescribed by, the canons of a church: as, “canonically admitted bishops,”
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
ad. in a canonical manner
Word Usage
"They're not "canonically" or "perfectly" optimized - after all, some other mammals can only see two independent colors, not three, and the precise sensitive bands may be shifted - but it is a qualitative argument why it is more likely for organisms to have eyes that are sensitive to the electromagnetic radiation that is easily available rather than the "rare" forms of light."