"bra-ket" meaning in English

{
  "etymology_text": "Concatenation of the terms bra and ket, which were introduced in 1939 and in turn derive from the splitting of the English word bracket.",
  "forms": [
    {
      "form": "bra-kets",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "bra-ket (plural bra-kets)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Physics",
          "orig": "en:Physics",
          "parents": [
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The scalar product of two vectors (and optionally an operator), in Hilbert space, where the left (row) vector is a bra and the right (column) vector is a ket. Symbolised by ⟨...|...⟩ (bra and ket only) or ⟨...|...|...⟩ (bra, operator, ket)."
      ],
      "id": "en-bra-ket-en-noun-fQwRpSvG",
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "scalar",
          "scalar"
        ],
        [
          "vector",
          "vector"
        ],
        [
          "operator",
          "operator"
        ],
        [
          "Hilbert space",
          "Hilbert space"
        ],
        [
          "bra",
          "bra"
        ],
        [
          "ket",
          "ket"
        ]
      ],
      "raw_glosses": [
        "(physics) The scalar product of two vectors (and optionally an operator), in Hilbert space, where the left (row) vector is a bra and the right (column) vector is a ket. Symbolised by ⟨...|...⟩ (bra and ket only) or ⟨...|...|...⟩ (bra, operator, ket)."
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ],
      "wikipedia": [
        "Bra–ket notation"
      ]
    }
  ],
  "word": "bra-ket"
}

{
  "etymology_text": "Concatenation of the terms bra and ket, which were introduced in 1939 and in turn derive from the splitting of the English word bracket.",
  "forms": [
    {
      "form": "bra-kets",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "bra-ket (plural bra-kets)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Physics"
      ],
      "glosses": [
        "The scalar product of two vectors (and optionally an operator), in Hilbert space, where the left (row) vector is a bra and the right (column) vector is a ket. Symbolised by ⟨...|...⟩ (bra and ket only) or ⟨...|...|...⟩ (bra, operator, ket)."
      ],
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "scalar",
          "scalar"
        ],
        [
          "vector",
          "vector"
        ],
        [
          "operator",
          "operator"
        ],
        [
          "Hilbert space",
          "Hilbert space"
        ],
        [
          "bra",
          "bra"
        ],
        [
          "ket",
          "ket"
        ]
      ],
      "raw_glosses": [
        "(physics) The scalar product of two vectors (and optionally an operator), in Hilbert space, where the left (row) vector is a bra and the right (column) vector is a ket. Symbolised by ⟨...|...⟩ (bra and ket only) or ⟨...|...|...⟩ (bra, operator, ket)."
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ],
      "wikipedia": [
        "Bra–ket notation"
      ]
    }
  ],
  "word": "bra-ket"
}