"-е-" meaning in Ukrainian

{
  "forms": [
    {
      "form": "-e-",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "uk",
        "2": "interfix"
      },
      "expansion": "-е- • (-e-)",
      "name": "head"
    }
  ],
  "lang": "Ukrainian",
  "lang_code": "uk",
  "pos": "interfix",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "(-o-) (used after palatalized and hushing consonants)",
          "word": "-о-"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Pages using catfix",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 4 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Ukrainian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Ukrainian interfixes",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "alternative form of -о- (-o-) (used after palatalized and hushing consonants)"
      ],
      "id": "en--е--uk-interfix-bIX8RXSX",
      "links": [
        [
          "-о-",
          "-о-#Ukrainian"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative",
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ ɛ ]"
    }
  ],
  "word": "-е-"
}

{
  "forms": [
    {
      "form": "-e-",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "uk",
        "2": "interfix"
      },
      "expansion": "-е- • (-e-)",
      "name": "head"
    }
  ],
  "lang": "Ukrainian",
  "lang_code": "uk",
  "pos": "interfix",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "(-o-) (used after palatalized and hushing consonants)",
          "word": "-о-"
        }
      ],
      "categories": [
        "Pages using catfix",
        "Pages with 4 entries",
        "Pages with entries",
        "Ukrainian entries with incorrect language header",
        "Ukrainian interfixes",
        "Ukrainian lemmas",
        "Ukrainian terms with IPA pronunciation"
      ],
      "glosses": [
        "alternative form of -о- (-o-) (used after palatalized and hushing consonants)"
      ],
      "links": [
        [
          "-о-",
          "-о-#Ukrainian"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative",
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ ɛ ]"
    }
  ],
  "word": "-е-"
}