"unitarity" meaning in English

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  "etymology_text": "From unitary + -ity.",
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  "lang_code": "en",
  "pos": "noun",
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          "word": "unitarity operator"
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        {
          "ref": "1993, George Sterman, An Introduction to Quantum Field Theory, page 334:",
          "text": "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.",
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        "The quality or state of being unitary."
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          "code": "el",
          "lang": "Greek",
          "roman": "monotéleia",
          "sense": "representation by a unitary operator",
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            "feminine"
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          "word": "μονοτέλεια"
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          "roman": "monopithanotikótita",
          "sense": "representation by a unitary operator",
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  "word": "unitarity"
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      "word": "unitarity operator"
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      "sense": "representation by a unitary operator",
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