"castellum" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "la",
        "3": "castellum"
      },
      "expansion": "Learned borrowing from Latin castellum",
      "name": "lbor"
    },
    {
      "args": {
        "1": "en",
        "2": "cashel",
        "3": "castell",
        "4": "castle",
        "5": "château"
      },
      "expansion": "Doublet of cashel, castell, castle, and château",
      "name": "doublet"
    }
  ],
  "etymology_text": "Learned borrowing from Latin castellum. Doublet of cashel, castell, castle, and château.",
  "forms": [
    {
      "form": "castella",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "castellums",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "castella",
        "2": "s"
      },
      "expansion": "castellum (plural castella or castellums)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A small Roman detached fort or fortlet used as a watch tower or signal station."
      ],
      "id": "en-castellum-en-noun-ar98fvp5",
      "links": [
        [
          "fortlet",
          "fortlet"
        ]
      ],
      "raw_glosses": [
        "(historical) A small Roman detached fort or fortlet used as a watch tower or signal station."
      ],
      "tags": [
        "historical"
      ],
      "wikipedia": [
        "castellum"
      ]
    }
  ],
  "word": "castellum"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "la",
        "3": "castellum"
      },
      "expansion": "Learned borrowing from Latin castellum",
      "name": "lbor"
    },
    {
      "args": {
        "1": "en",
        "2": "cashel",
        "3": "castell",
        "4": "castle",
        "5": "château"
      },
      "expansion": "Doublet of cashel, castell, castle, and château",
      "name": "doublet"
    }
  ],
  "etymology_text": "Learned borrowing from Latin castellum. Doublet of cashel, castell, castle, and château.",
  "forms": [
    {
      "form": "castella",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "castellums",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "castella",
        "2": "s"
      },
      "expansion": "castellum (plural castella or castellums)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English doublets",
        "English entries with incorrect language header",
        "English learned borrowings from Latin",
        "English lemmas",
        "English nouns",
        "English nouns with irregular plurals",
        "English terms borrowed from Latin",
        "English terms derived from Latin",
        "English terms with historical senses"
      ],
      "glosses": [
        "A small Roman detached fort or fortlet used as a watch tower or signal station."
      ],
      "links": [
        [
          "fortlet",
          "fortlet"
        ]
      ],
      "raw_glosses": [
        "(historical) A small Roman detached fort or fortlet used as a watch tower or signal station."
      ],
      "tags": [
        "historical"
      ],
      "wikipedia": [
        "castellum"
      ]
    }
  ],
  "word": "castellum"
}