"πόσαι" meaning in Ancient Greek

{
  "forms": [
    {
      "form": "pósai",
      "tags": [
        "romanization"
      ]
    }
  ],
  "lang": "Ancient Greek",
  "lang_code": "grc",
  "pos": "pron",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Ancient Greek entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "extra": "pósos",
          "word": "πόσος"
        }
      ],
      "glosses": [
        "feminine nominative plural of πόσος (pósos)"
      ],
      "id": "en-πόσαι-grc-pron-Ew~ijG-P",
      "links": [
        [
          "πόσος",
          "πόσος#Ancient_Greek"
        ]
      ],
      "tags": [
        "feminine",
        "form-of",
        "nominative",
        "plural"
      ]
    }
  ],
  "word": "πόσαι"
}

{
  "forms": [
    {
      "form": "pósai",
      "tags": [
        "romanization"
      ]
    }
  ],
  "lang": "Ancient Greek",
  "lang_code": "grc",
  "pos": "pron",
  "senses": [
    {
      "categories": [
        "Ancient Greek entries with incorrect language header",
        "Ancient Greek non-lemma forms",
        "Ancient Greek paroxytone terms",
        "Ancient Greek pronoun forms",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "form_of": [
        {
          "extra": "pósos",
          "word": "πόσος"
        }
      ],
      "glosses": [
        "feminine nominative plural of πόσος (pósos)"
      ],
      "links": [
        [
          "πόσος",
          "πόσος#Ancient_Greek"
        ]
      ],
      "tags": [
        "feminine",
        "form-of",
        "nominative",
        "plural"
      ]
    }
  ],
  "word": "πόσαι"
}