"-poleis" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "grc",
        "3": "πόλεις",
        "t": "cities"
      },
      "expansion": "Ancient Greek πόλεις (póleis, “cities”)",
      "name": "bor"
    },
    {
      "args": {
        "1": "grc",
        "2": "πόλις",
        "t": "city"
      },
      "expansion": "πόλις (pólis, “city”)",
      "name": "m"
    }
  ],
  "etymology_text": "From Ancient Greek πόλεις (póleis, “cities”), nominative plural form of πόλις (pólis, “city”).",
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "suffix forms"
      },
      "expansion": "-poleis",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English plurals in -eis with singular in -is",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "-polis"
        }
      ],
      "glosses": [
        "plural of -polis"
      ],
      "id": "en--poleis-en-suffix-Z8qaQmXE",
      "links": [
        [
          "-polis",
          "-polis#English"
        ]
      ],
      "tags": [
        "form-of",
        "morpheme",
        "plural"
      ]
    }
  ],
  "word": "-poleis"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "grc",
        "3": "πόλεις",
        "t": "cities"
      },
      "expansion": "Ancient Greek πόλεις (póleis, “cities”)",
      "name": "bor"
    },
    {
      "args": {
        "1": "grc",
        "2": "πόλις",
        "t": "city"
      },
      "expansion": "πόλις (pólis, “city”)",
      "name": "m"
    }
  ],
  "etymology_text": "From Ancient Greek πόλεις (póleis, “cities”), nominative plural form of πόλις (pólis, “city”).",
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "suffix forms"
      },
      "expansion": "-poleis",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English non-lemma forms",
        "English plurals in -eis with singular in -is",
        "English suffix forms",
        "English terms borrowed from Ancient Greek",
        "English terms derived from Ancient Greek"
      ],
      "form_of": [
        {
          "word": "-polis"
        }
      ],
      "glosses": [
        "plural of -polis"
      ],
      "links": [
        [
          "-polis",
          "-polis#English"
        ]
      ],
      "tags": [
        "form-of",
        "morpheme",
        "plural"
      ]
    }
  ],
  "word": "-poleis"
}