"chron" meaning in English

{
  "etymology_text": "Apparently from chrono-, perhaps for resonance with eon.",
  "forms": [
    {
      "form": "chrons",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "chron (plural chrons)",
      "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": "topical",
          "langcode": "en",
          "name": "Geology",
          "orig": "en:Geology",
          "parents": [
            "Earth sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "chronozone"
        },
        {
          "word": "subchron"
        },
        {
          "word": "superchron"
        }
      ],
      "glosses": [
        "A period of time between two geomagnetic reversals."
      ],
      "id": "en-chron-en-noun-K10ljhym",
      "links": [
        [
          "geology",
          "geology"
        ]
      ],
      "raw_glosses": [
        "(geology) A period of time between two geomagnetic reversals."
      ],
      "topics": [
        "geography",
        "geology",
        "natural-sciences"
      ],
      "wikipedia": [
        "chron"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/kɹɒn/"
    },
    {
      "rhymes": "-ɒn"
    }
  ],
  "word": "chron"
}

{
  "derived": [
    {
      "word": "chronozone"
    },
    {
      "word": "subchron"
    },
    {
      "word": "superchron"
    }
  ],
  "etymology_text": "Apparently from chrono-, perhaps for resonance with eon.",
  "forms": [
    {
      "form": "chrons",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "chron (plural chrons)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English 1-syllable words",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms with IPA pronunciation",
        "Rhymes:English/ɒn",
        "Rhymes:English/ɒn/1 syllable",
        "en:Geology"
      ],
      "glosses": [
        "A period of time between two geomagnetic reversals."
      ],
      "links": [
        [
          "geology",
          "geology"
        ]
      ],
      "raw_glosses": [
        "(geology) A period of time between two geomagnetic reversals."
      ],
      "topics": [
        "geography",
        "geology",
        "natural-sciences"
      ],
      "wikipedia": [
        "chron"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/kɹɒn/"
    },
    {
      "rhymes": "-ɒn"
    }
  ],
  "word": "chron"
}