"-ή" meaning in Ancient Greek

{
  "forms": [
    {
      "form": "-ḗ",
      "tags": [
        "alternative"
      ]
    },
    {
      "form": "-ῆς",
      "tags": [
        "genitive"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-ῆς",
        "2": "f",
        "3": "first"
      },
      "expansion": "-ή • (-ḗ) f (genitive -ῆς); first declension",
      "name": "grc-noun"
    }
  ],
  "lang": "Ancient Greek",
  "lang_code": "grc",
  "pos": "suffix",
  "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": "Ancient Greek feminine nouns in the first declension",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Ancient Greek terms with redundant script codes",
          "parents": [
            "Terms with redundant script codes",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "extra": "-ē",
          "word": "-η"
        }
      ],
      "glosses": [
        "stressed form of -η (-ē)"
      ],
      "id": "en--ή-grc-suffix-vqXNw9Pt",
      "links": [
        [
          "-η",
          "-η#Ancient Greek"
        ]
      ],
      "tags": [
        "form-of",
        "morpheme",
        "stressed"
      ]
    }
  ],
  "word": "-ή"
}

{
  "forms": [
    {
      "form": "-ḗ",
      "tags": [
        "alternative"
      ]
    },
    {
      "form": "-ῆς",
      "tags": [
        "genitive"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-ῆς",
        "2": "f",
        "3": "first"
      },
      "expansion": "-ή • (-ḗ) f (genitive -ῆς); first declension",
      "name": "grc-noun"
    }
  ],
  "lang": "Ancient Greek",
  "lang_code": "grc",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        "Ancient Greek entries with incorrect language header",
        "Ancient Greek feminine nouns",
        "Ancient Greek feminine nouns in the first declension",
        "Ancient Greek feminine suffixes",
        "Ancient Greek first-declension nouns",
        "Ancient Greek lemmas",
        "Ancient Greek noun-forming suffixes",
        "Ancient Greek oxytone terms",
        "Ancient Greek suffixes",
        "Ancient Greek terms with redundant script codes"
      ],
      "form_of": [
        {
          "extra": "-ē",
          "word": "-η"
        }
      ],
      "glosses": [
        "stressed form of -η (-ē)"
      ],
      "links": [
        [
          "-η",
          "-η#Ancient Greek"
        ]
      ],
      "tags": [
        "form-of",
        "morpheme",
        "stressed"
      ]
    }
  ],
  "word": "-ή"
}