the GNU version of the Collaborative International Dictionary of English
n. The quality or state of being identical; sameness.
The Century Dictionary and Cyclopedia
n. The state or quality of being identical; sameness.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. exact sameness
Word Usage
"Had they not worn different colors, it would have been impossible to tell them apart, and that was very strange in mature men: identicalness diminished with the years."