"grand-mother" meaning in English

{
  "forms": [
    {
      "form": "grand-mothers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "head": "grand-mother"
      },
      "expansion": "grand-mother (plural grand-mothers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "grandmother"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1766, James Fordyce, “On Female Reserve”, in Sermons to Young Women, 6th edition, volume I, London: […] D. Payne, page 60",
          "text": "But ah, how great would be their aſtoniſhment and horror, when informed, that numbers of thoſe young perſons, whoſe behaviour was ſo unbecoming, had not been taught by their mothers, their grand-mothers, or any female friend in the world, one ſolid lesson of wiſdom, frugality, or amiable reſerve.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Obsolete form of grandmother."
      ],
      "id": "en-grand-mother-en-noun-A-qjs7SF",
      "links": [
        [
          "grandmother",
          "grandmother#English"
        ]
      ],
      "tags": [
        "alt-of",
        "obsolete"
      ]
    }
  ],
  "word": "grand-mother"
}

{
  "forms": [
    {
      "form": "grand-mothers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "head": "grand-mother"
      },
      "expansion": "grand-mother (plural grand-mothers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "grandmother"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English obsolete forms",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "1766, James Fordyce, “On Female Reserve”, in Sermons to Young Women, 6th edition, volume I, London: […] D. Payne, page 60",
          "text": "But ah, how great would be their aſtoniſhment and horror, when informed, that numbers of thoſe young perſons, whoſe behaviour was ſo unbecoming, had not been taught by their mothers, their grand-mothers, or any female friend in the world, one ſolid lesson of wiſdom, frugality, or amiable reſerve.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Obsolete form of grandmother."
      ],
      "links": [
        [
          "grandmother",
          "grandmother#English"
        ]
      ],
      "tags": [
        "alt-of",
        "obsolete"
      ]
    }
  ],
  "word": "grand-mother"
}