"甲午" meaning in Korean

{
  "forms": [
    {
      "form": "Gabo",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "갑오",
      "tags": [
        "hangeul"
      ]
    }
  ],
  "lang": "Korean",
  "lang_code": "ko",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Korean entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Korean terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Korean terms with redundant script codes",
          "parents": [
            "Terms with redundant script codes",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 3 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "extra": "Wood Horse, the thirty-first in the sexagenary cycle",
          "word": "갑오"
        }
      ],
      "glosses": [
        "hanja form of 갑오 (“Wood Horse, the thirty-first in the sexagenary cycle”)"
      ],
      "id": "en-甲午-ko-name-4LUAg~TC",
      "links": [
        [
          "hanja",
          "hanja#English"
        ],
        [
          "갑오",
          "갑오#Korean"
        ]
      ],
      "tags": [
        "form-of",
        "hanja"
      ]
    }
  ],
  "word": "甲午"
}

{
  "forms": [
    {
      "form": "Gabo",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "갑오",
      "tags": [
        "hangeul"
      ]
    }
  ],
  "lang": "Korean",
  "lang_code": "ko",
  "pos": "name",
  "senses": [
    {
      "categories": [
        "Korean entries with incorrect language header",
        "Korean hanja forms",
        "Korean lemmas",
        "Korean proper nouns",
        "Korean proper nouns in Han script",
        "Korean terms with non-redundant non-automated sortkeys",
        "Korean terms with redundant script codes",
        "Pages with 3 entries",
        "Pages with entries"
      ],
      "form_of": [
        {
          "extra": "Wood Horse, the thirty-first in the sexagenary cycle",
          "word": "갑오"
        }
      ],
      "glosses": [
        "hanja form of 갑오 (“Wood Horse, the thirty-first in the sexagenary cycle”)"
      ],
      "links": [
        [
          "hanja",
          "hanja#English"
        ],
        [
          "갑오",
          "갑오#Korean"
        ]
      ],
      "tags": [
        "form-of",
        "hanja"
      ]
    }
  ],
  "word": "甲午"
}