"æs alienum" meaning in Latin

{
  "forms": [
    {
      "form": "æs aliēnum",
      "tags": [
        "canonical",
        "neuter"
      ]
    },
    {
      "form": "æris aliēnī",
      "tags": [
        "genitive"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "æs/ær<3.N> aliēnum<+>"
      },
      "expansion": "æs aliēnum n (genitive æris aliēnī); third declension",
      "name": "la-noun"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "aes alienum"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Latin entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Latin neuter nouns in the third declension",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Alternative spelling of aes alienum"
      ],
      "id": "en-æs_alienum-la-noun-DfVB0gKK",
      "links": [
        [
          "aes alienum",
          "aes alienum#Latin"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative",
        "declension-3"
      ]
    }
  ],
  "word": "æs alienum"
}

{
  "forms": [
    {
      "form": "æs aliēnum",
      "tags": [
        "canonical",
        "neuter"
      ]
    },
    {
      "form": "æris aliēnī",
      "tags": [
        "genitive"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "æs/ær<3.N> aliēnum<+>"
      },
      "expansion": "æs aliēnum n (genitive æris aliēnī); third declension",
      "name": "la-noun"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "aes alienum"
        }
      ],
      "categories": [
        "Latin entries with incorrect language header",
        "Latin lemmas",
        "Latin multiword terms",
        "Latin neuter nouns",
        "Latin neuter nouns in the third declension",
        "Latin nouns",
        "Latin nouns with red links in their inflection tables",
        "Latin terms spelled with Æ",
        "Latin third declension nouns"
      ],
      "glosses": [
        "Alternative spelling of aes alienum"
      ],
      "links": [
        [
          "aes alienum",
          "aes alienum#Latin"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative",
        "declension-3"
      ]
    }
  ],
  "word": "æs alienum"
}