unitarity

English

Etymology

From unitary +‎ -ity.

Noun

unitarity (countable and uncountable, plural unitarities)

The quality or state of being unitary.
- 1993, George Sterman, An Introduction to Quantum Field Theory, page 334:
  In this section, we shall prove the gauge invariance and unitarity of the physical S-matrix in quantum electrodynamics, to all orders in the renormalized perturbation theory.

Usage notes

(quality or state): The synonymous noun unitariness exists as well, but unitarity and unitariness are each preferred (at least partly) in different fields. Overall, unitarity is more common than unitariness.

Derived terms

unitarity operator, unitarity triangle

Translations

representation by a unitary operator

Greek: μονοτέλεια f (monotéleia), rare: μονοπιθανοτικότητα f (monopithanotikótita)

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