"ㅏ" meaning in Korean

{
  "etymology_templates": [
    {
      "args": {
        "1": "ko",
        "2": "한글",
        "3": "",
        "4": "Great script, Korean script"
      },
      "expansion": "한글 (han'geul, “Great script, Korean script”)",
      "name": "m"
    },
    {
      "args": {
        "1": "ko",
        "2": "조선글",
        "3": "",
        "4": "Korean script"
      },
      "expansion": "조선글 (joseon'geul, “Korean script”)",
      "name": "m"
    },
    {
      "args": {},
      "expansion": "Hunmin Jeongeum Haerye “Explanations and Examples of the Proper Sounds for the Instruction of the People” (1446), defining and explaining the script now known as 한글 (han'geul, “Great script, Korean script”) in South Korea and 조선글 (joseon'geul, “Korean script”) in North Korea.",
      "name": "ko-etym-jamo"
    }
  ],
  "etymology_text": "Hunmin Jeongeum Haerye “Explanations and Examples of the Proper Sounds for the Instruction of the People” (1446), defining and explaining the script now known as 한글 (han'geul, “Great script, Korean script”) in South Korea and 조선글 (joseon'geul, “Korean script”) in North Korea.",
  "forms": [
    {
      "form": "a",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "letter"
      },
      "expansion": "ㅏ • (a)",
      "name": "ko-pos"
    }
  ],
  "lang": "Korean",
  "lang_code": "ko",
  "pos": "character",
  "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 redundant script codes",
          "parents": [
            "Terms with redundant script codes",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Korean terms with redundant transliterations",
          "parents": [
            "Terms with redundant transliterations",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "derived": [
        {
          "english": "ya",
          "word": "ㅑ"
        },
        {
          "roman": "ae",
          "word": "ㅐ"
        },
        {
          "roman": "yae",
          "word": "ㅒ"
        },
        {
          "roman": "wa",
          "word": "ㅘ"
        }
      ],
      "glosses": [
        "아 (a), a vowel of the Korean alphabet, hangeul."
      ],
      "id": "en-ㅏ-ko-character-FAzH66HM",
      "links": [
        [
          "아",
          "아"
        ],
        [
          "hangeul",
          "hangeul"
        ]
      ],
      "tags": [
        "letter"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[a̠]"
    }
  ],
  "word": "ㅏ"
}

{
  "derived": [
    {
      "english": "ya",
      "word": "ㅑ"
    },
    {
      "roman": "ae",
      "word": "ㅐ"
    },
    {
      "roman": "yae",
      "word": "ㅒ"
    },
    {
      "roman": "wa",
      "word": "ㅘ"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "ko",
        "2": "한글",
        "3": "",
        "4": "Great script, Korean script"
      },
      "expansion": "한글 (han'geul, “Great script, Korean script”)",
      "name": "m"
    },
    {
      "args": {
        "1": "ko",
        "2": "조선글",
        "3": "",
        "4": "Korean script"
      },
      "expansion": "조선글 (joseon'geul, “Korean script”)",
      "name": "m"
    },
    {
      "args": {},
      "expansion": "Hunmin Jeongeum Haerye “Explanations and Examples of the Proper Sounds for the Instruction of the People” (1446), defining and explaining the script now known as 한글 (han'geul, “Great script, Korean script”) in South Korea and 조선글 (joseon'geul, “Korean script”) in North Korea.",
      "name": "ko-etym-jamo"
    }
  ],
  "etymology_text": "Hunmin Jeongeum Haerye “Explanations and Examples of the Proper Sounds for the Instruction of the People” (1446), defining and explaining the script now known as 한글 (han'geul, “Great script, Korean script”) in South Korea and 조선글 (joseon'geul, “Korean script”) in North Korea.",
  "forms": [
    {
      "form": "a",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "letter"
      },
      "expansion": "ㅏ • (a)",
      "name": "ko-pos"
    }
  ],
  "lang": "Korean",
  "lang_code": "ko",
  "pos": "character",
  "senses": [
    {
      "categories": [
        "Korean entries with incorrect language header",
        "Korean lemmas",
        "Korean letters",
        "Korean terms with IPA pronunciation",
        "Korean terms with redundant script codes",
        "Korean terms with redundant transliterations",
        "Korean terms without ko-IPA template"
      ],
      "glosses": [
        "아 (a), a vowel of the Korean alphabet, hangeul."
      ],
      "links": [
        [
          "아",
          "아"
        ],
        [
          "hangeul",
          "hangeul"
        ]
      ],
      "tags": [
        "letter"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[a̠]"
    }
  ],
  "word": "ㅏ"
}