"есмь" meaning in Russian

{
  "etymology_templates": [
    {
      "args": {
        "1": "ru",
        "2": "sla-pro",
        "3": "*esmь"
      },
      "expansion": "Proto-Slavic *esmь",
      "name": "inh"
    }
  ],
  "etymology_text": "From Proto-Slavic *esmь.",
  "forms": [
    {
      "form": "jesmʹ",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ru",
        "2": "verb form"
      },
      "expansion": "есмь • (jesmʹ)",
      "name": "head"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Russian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "extra": "(bytʹ); (I) am",
          "word": "быть"
        }
      ],
      "glosses": [
        "first-person singular present indicative imperfective of быть (bytʹ); (I) am"
      ],
      "id": "en-есмь-ru-verb-vOEx2lmG",
      "links": [
        [
          "быть",
          "быть#Russian"
        ],
        [
          "I",
          "I"
        ],
        [
          "am",
          "am"
        ]
      ],
      "raw_glosses": [
        "(obsolete) first-person singular present indicative imperfective of быть (bytʹ); (I) am"
      ],
      "tags": [
        "first-person",
        "form-of",
        "imperfective",
        "indicative",
        "obsolete",
        "present",
        "singular"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[jesmʲ]"
    }
  ],
  "word": "есмь"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "ru",
        "2": "sla-pro",
        "3": "*esmь"
      },
      "expansion": "Proto-Slavic *esmь",
      "name": "inh"
    }
  ],
  "etymology_text": "From Proto-Slavic *esmь.",
  "forms": [
    {
      "form": "jesmʹ",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ru",
        "2": "verb form"
      },
      "expansion": "есмь • (jesmʹ)",
      "name": "head"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "Russian 1-syllable words",
        "Russian entries with incorrect language header",
        "Russian non-lemma forms",
        "Russian terms derived from Proto-Slavic",
        "Russian terms inherited from Proto-Slavic",
        "Russian terms with IPA pronunciation",
        "Russian terms with obsolete senses",
        "Russian verb forms"
      ],
      "form_of": [
        {
          "extra": "(bytʹ); (I) am",
          "word": "быть"
        }
      ],
      "glosses": [
        "first-person singular present indicative imperfective of быть (bytʹ); (I) am"
      ],
      "links": [
        [
          "быть",
          "быть#Russian"
        ],
        [
          "I",
          "I"
        ],
        [
          "am",
          "am"
        ]
      ],
      "raw_glosses": [
        "(obsolete) first-person singular present indicative imperfective of быть (bytʹ); (I) am"
      ],
      "tags": [
        "first-person",
        "form-of",
        "imperfective",
        "indicative",
        "obsolete",
        "present",
        "singular"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[jesmʲ]"
    }
  ],
  "word": "есмь"
}