"petahertz" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "peta",
        "3": "hertz"
      },
      "expansion": "peta- + hertz",
      "name": "prefix"
    }
  ],
  "etymology_text": "peta- + hertz.",
  "forms": [
    {
      "form": "petahertz",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "petahertz"
      },
      "expansion": "petahertz (plural petahertz)",
      "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": "English terms prefixed with peta-",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Metrology",
          "orig": "en:Metrology",
          "parents": [
            "Applied sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "SI units",
          "orig": "en:SI units",
          "parents": [
            "Units of measure",
            "Metrology",
            "Quantity",
            "Applied sciences",
            "Mathematics",
            "Sciences",
            "Formal sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "derived": [
        {
          "tags": [
            "abbreviation"
          ],
          "word": "PHz"
        }
      ],
      "glosses": [
        "An SI unit of frequency equal to 10¹⁵ hertz."
      ],
      "id": "en-petahertz-en-noun-av1t2WDz",
      "links": [
        [
          "metrology",
          "metrology"
        ],
        [
          "frequency",
          "frequency"
        ],
        [
          "hertz",
          "hertz"
        ]
      ],
      "raw_glosses": [
        "(metrology) An SI unit of frequency equal to 10¹⁵ hertz."
      ],
      "topics": [
        "metrology"
      ]
    }
  ],
  "word": "petahertz"
}

{
  "derived": [
    {
      "tags": [
        "abbreviation"
      ],
      "word": "PHz"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "peta",
        "3": "hertz"
      },
      "expansion": "peta- + hertz",
      "name": "prefix"
    }
  ],
  "etymology_text": "peta- + hertz.",
  "forms": [
    {
      "form": "petahertz",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "petahertz"
      },
      "expansion": "petahertz (plural petahertz)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English indeclinable nouns",
        "English lemmas",
        "English nouns",
        "English nouns with irregular plurals",
        "English terms prefixed with peta-",
        "en:Metrology",
        "en:SI units"
      ],
      "glosses": [
        "An SI unit of frequency equal to 10¹⁵ hertz."
      ],
      "links": [
        [
          "metrology",
          "metrology"
        ],
        [
          "frequency",
          "frequency"
        ],
        [
          "hertz",
          "hertz"
        ]
      ],
      "raw_glosses": [
        "(metrology) An SI unit of frequency equal to 10¹⁵ hertz."
      ],
      "topics": [
        "metrology"
      ]
    }
  ],
  "word": "petahertz"
}