"mẫu tự" meaning in Vietnamese

{
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        "2": "Sino-Vietnamese words"
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      "expansion": "",
      "name": "categorize"
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    {
      "args": {
        "1": "母",
        "2": "mother",
        "3": "字",
        "4": "character"
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      "expansion": "Sino-Vietnamese word from 母字, composed of 母 (“mother”) and 字 (“character”)",
      "name": "vi-etym-sino"
    },
    {
      "args": {
        "1": "vi",
        "2": "zh",
        "3": "字母",
        "tr": "tự mẫu"
      },
      "expansion": "Chinese 字母 (tự mẫu)",
      "name": "der"
    }
  ],
  "etymology_text": "Sino-Vietnamese word from 母字, composed of 母 (“mother”) and 字 (“character”), anagram and misconstruction of Chinese 字母 (tự mẫu), perhaps due to the influence of chữ cái. Compare the case of có mặt (native compound) and hiện diện (its sinicized internal calque counterpart).",
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        "2": "noun",
        "3": "",
        "4": "",
        "head": "",
        "tr": ""
      },
      "expansion": "mẫu tự",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "mẫu tự",
      "name": "vi-noun"
    }
  ],
  "lang": "Vietnamese",
  "lang_code": "vi",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Chinese terms with non-redundant manual transliterations",
          "parents": [
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            "Entry maintenance"
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          "source": "w"
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          "parents": [],
          "source": "w"
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          "parents": [],
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          "orig": "vi:Orthography",
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            "Writing",
            "Human behaviour",
            "Language",
            "Human",
            "Communication",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "letter"
      ],
      "id": "en-mẫu_tự-vi-noun--AEF76tt",
      "links": [
        [
          "orthography",
          "orthography"
        ],
        [
          "letter",
          "letter#English"
        ]
      ],
      "raw_glosses": [
        "(formal, orthography) letter"
      ],
      "related": [
        {
          "word": "thanh mẫu"
        },
        {
          "word": "vận mẫu"
        }
      ],
      "synonyms": [
        {
          "word": "chữ cái"
        }
      ],
      "tags": [
        "formal"
      ],
      "topics": [
        "communications",
        "journalism",
        "literature",
        "media",
        "orthography",
        "publishing",
        "writing"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[məw˦ˀ˥ tɨ˧˨ʔ]",
      "tags": [
        "Hà-Nội"
      ]
    },
    {
      "ipa": "[məw˧˨ tɨ˨˩ʔ]",
      "tags": [
        "Huế"
      ]
    },
    {
      "ipa": "[məw˨˩˦ tɨ˨˩˨]",
      "note": "Saigon"
    }
  ],
  "word": "mẫu tự"
}

{
  "etymology_templates": [
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        "2": "母字"
      },
      "expansion": "",
      "name": "etymid"
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    {
      "args": {
        "1": "vi",
        "2": "Sino-Vietnamese words"
      },
      "expansion": "",
      "name": "categorize"
    },
    {
      "args": {
        "1": "母",
        "2": "mother",
        "3": "字",
        "4": "character"
      },
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      "name": "vi-etym-sino"
    },
    {
      "args": {
        "1": "vi",
        "2": "zh",
        "3": "字母",
        "tr": "tự mẫu"
      },
      "expansion": "Chinese 字母 (tự mẫu)",
      "name": "der"
    }
  ],
  "etymology_text": "Sino-Vietnamese word from 母字, composed of 母 (“mother”) and 字 (“character”), anagram and misconstruction of Chinese 字母 (tự mẫu), perhaps due to the influence of chữ cái. Compare the case of có mặt (native compound) and hiện diện (its sinicized internal calque counterpart).",
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        "4": "",
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        "tr": ""
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      "expansion": "mẫu tự",
      "name": "head"
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      "args": {},
      "expansion": "mẫu tự",
      "name": "vi-noun"
    }
  ],
  "lang": "Vietnamese",
  "lang_code": "vi",
  "pos": "noun",
  "related": [
    {
      "word": "thanh mẫu"
    },
    {
      "word": "vận mẫu"
    }
  ],
  "senses": [
    {
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        "Pages with 1 entry",
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        "Vietnamese formal terms",
        "Vietnamese lemmas",
        "Vietnamese misconstructions",
        "Vietnamese nouns",
        "Vietnamese terms derived from Chinese",
        "Vietnamese terms with IPA pronunciation",
        "vi:Orthography"
      ],
      "glosses": [
        "letter"
      ],
      "links": [
        [
          "orthography",
          "orthography"
        ],
        [
          "letter",
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        "(formal, orthography) letter"
      ],
      "synonyms": [
        {
          "word": "chữ cái"
        }
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      "tags": [
        "formal"
      ],
      "topics": [
        "communications",
        "journalism",
        "literature",
        "media",
        "orthography",
        "publishing",
        "writing"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[məw˦ˀ˥ tɨ˧˨ʔ]",
      "tags": [
        "Hà-Nội"
      ]
    },
    {
      "ipa": "[məw˧˨ tɨ˨˩ʔ]",
      "tags": [
        "Huế"
      ]
    },
    {
      "ipa": "[məw˨˩˦ tɨ˨˩˨]",
      "note": "Saigon"
    }
  ],
  "word": "mẫu tự"
}