"gn." meaning in English

{
  "forms": [
    {
      "form": "gns.",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "gns."
      },
      "expansion": "gn. (plural gns.)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "currency unit",
          "word": "guinea"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1890, The Educational Annual, page 126",
          "text": "[…] school laboratory 3 gns. a term; carpenter's shop 2 gns.: entrance fees (boarders) 4 guineas, and (day pupils) 2 guineas: […]",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Abbreviation of guinea (“currency unit”)."
      ],
      "id": "en-gn.-en-noun-D4Zt~Ibo",
      "links": [
        [
          "guinea",
          "guinea#English"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "word": "gn."
}

{
  "forms": [
    {
      "form": "gns.",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "gns."
      },
      "expansion": "gn. (plural gns.)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "currency unit",
          "word": "guinea"
        }
      ],
      "categories": [
        "English abbreviations",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English nouns with irregular plurals",
        "English terms spelled with .",
        "English terms with quotations",
        "English words without vowels",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "1890, The Educational Annual, page 126",
          "text": "[…] school laboratory 3 gns. a term; carpenter's shop 2 gns.: entrance fees (boarders) 4 guineas, and (day pupils) 2 guineas: […]",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Abbreviation of guinea (“currency unit”)."
      ],
      "links": [
        [
          "guinea",
          "guinea#English"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "word": "gn."
}