Definitions
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 noun The quality or state of being
unitary .
Etymologies
from Wiktionary, Creative Commons Attribution/ShareAlike License
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Examples

Since unitarity is fundamental to field theory, this result had a certain importance.

Until now, unitarity triangle measurements have been maddeningly consistent with the amount of CP violation predicted by the standard model alone.
A NonTechnical Explanation of Flavo(u)r Physics « Imaginary Potential 2008

Any such theory that retains unitarity would require, for example, that each of the patches into which a de Sitter region evolves be different in some way from the original patch, such that they individually have fewer degrees of freedom.
The Arrow of Time in Scientific American Sean 2008

Since there are more such regions, it would appear that the total number of degrees of freedom has increased, in violation of unitarity.
The Arrow of Time in Scientific American Sean 2008

When the system S+O is considered from the point of view of O², the measurement can be seen as an interaction whose dynamics is fully unitary, whereas by the point of view of O the measurement breaks the unitarity of the evolution of S.
Relational Quantum Mechanics Laudisa, Federico 2008

So, why should a quantum theory of gravity retain unitarity?
The Arrow of Time in Scientific American Sean 2008

What will be tested are general properties of unitarity, analyticity, and lorentz invarianceproperties that are not unique to string theory.

And then the problem is that either the entropy is decreasing during that collapse, for no good reason and in contradiction with everything we think we know about gravitational dynamics, or it is increasing during the collapse, yet supposedly gives rise to an extraordinarily lowentropy condition on the other side, for no good reason and in contradiction with everything we think we know about unitarity and thermodynamics.
Against Bounces Sean 2007

There are many known examples: Lagrangian theory, thermal properties, foundations of quantum formalism, unitarity, all the crackpotism about Landscape and CC, epiroktic scenarios, etc.
The String Theory Backlash Sean 2006

The unitarity theorem would break down, thus signaling Quantum Mechanics needs to be overhauled!
Most Surprising LHC Discovery? JoAnne 2006
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