Noun
unitarity (countable and uncountable, plural unitarities)
The quality or state of being unitary.
Such properties include the completeness, orthogonality, Plancherel/Parseval, periodicity, shift, convolution, and unitarity properties above, as well as many FFT algorithms. Source: Internet
Diagrams involving Faddeev–Popov ghosts must be considered too (except in the unitarity gauge ). Source: Internet
This property is usually referred to as unitarity of time evolution. Source: Internet