"-em" meaning in Polish

{
  "etymology_templates": [
    {
      "args": {
        "1": "pl",
        "2": ":inh",
        "3": "zlw-opl:-em<ety:inh<sla-pro:*-emь><sla-pro:*-ъ̀mь><sla-pro:*-ь̀mь>>",
        "tree": "+"
      },
      "expansion": "Etymology tree\nProto-Slavic *-emь\nProto-Slavic *-ъ̀mь\nProto-Slavic *-ь̀mь\nOld Polish -em\nPolish -em\n[Appendix:Glossary#inherited|Inherited]] from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Old Polish\", \"term\" : \"-em\", \"status\" : \"inline\", \"lang\" : \"zlw-opl\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Polish\", \"term\" : \"-em\", \"status\" : \"ok\", \"lang\" : \"pl\" }\" data-lang=\"pl\" data-title=\"-em\">",
      "name": "ety"
    },
    {
      "args": {
        "1": "",
        "2": "i",
        "3": "I"
      },
      "expansion": "I",
      "name": "yesno"
    },
    {
      "args": {
        "1": "Inherited"
      },
      "expansion": "Inherited",
      "name": "glossary"
    },
    {
      "args": {
        "1": "pl",
        "2": "zlw-opl",
        "3": "-em",
        "4": "",
        "5": "",
        "g": "",
        "g2": "",
        "g3": "",
        "id": "",
        "lit": "",
        "nocat": "",
        "pos": "",
        "sc": "",
        "sort": "",
        "tr": "",
        "ts": ""
      },
      "expansion": "Old Polish -em",
      "name": "inh"
    },
    {
      "args": {
        "1": "pl",
        "2": "zlw-opl",
        "3": "-em"
      },
      "expansion": "Inherited from Old Polish -em",
      "name": "inh+"
    },
    {
      "args": {
        "1": "pl",
        "2": "sla-pro",
        "3": "",
        "4": "*-emь/-ъ̀mь/-ь̀mь"
      },
      "expansion": "Proto-Slavic *-emь/-ъ̀mь/-ь̀mь",
      "name": "inh"
    }
  ],
  "etymology_text": "Etymology tree\nProto-Slavic *-emь\nProto-Slavic *-ъ̀mь\nProto-Slavic *-ь̀mь\nOld Polish -em\nPolish -em\nInherited from Old Polish -em, from Proto-Slavic *-emь/-ъ̀mь/-ь̀mь.",
  "forms": [
    {
      "form": "-iem",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "pl",
        "2": "suffix"
      },
      "expansion": "-em",
      "name": "head"
    }
  ],
  "hyphenation": [
    "-em"
  ],
  "hyphenations": [
    {
      "parts": [
        "",
        "em"
      ]
    }
  ],
  "lang": "Polish",
  "lang_code": "pl",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages using etymon with no ID",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 14 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with etymology trees",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Polish entries with etymology trees",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Polish entries with incorrect language header",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "forms the instrumental singular of nouns of declension types: masculine I, II, III, IV, V; neuter I, II, III, IV, V"
      ],
      "id": "en--em-pl-suffix-XzTiPgGJ",
      "links": [
        [
          "instrumental",
          "Appendix:Glossary#instrumental_case"
        ],
        [
          "singular",
          "Appendix:Glossary#singular_number"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ɛm/"
    },
    {
      "rhymes": "-ɛm"
    }
  ],
  "word": "-em"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "pl",
        "2": ":inh",
        "3": "zlw-opl:-em<ety:inh<sla-pro:*-emь><sla-pro:*-ъ̀mь><sla-pro:*-ь̀mь>>",
        "tree": "+"
      },
      "expansion": "Etymology tree\nProto-Slavic *-emь\nProto-Slavic *-ъ̀mь\nProto-Slavic *-ь̀mь\nOld Polish -em\nPolish -em\n[Appendix:Glossary#inherited|Inherited]] from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Old Polish\", \"term\" : \"-em\", \"status\" : \"inline\", \"lang\" : \"zlw-opl\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Polish\", \"term\" : \"-em\", \"status\" : \"ok\", \"lang\" : \"pl\" }\" data-lang=\"pl\" data-title=\"-em\">",
      "name": "ety"
    },
    {
      "args": {
        "1": "",
        "2": "i",
        "3": "I"
      },
      "expansion": "I",
      "name": "yesno"
    },
    {
      "args": {
        "1": "Inherited"
      },
      "expansion": "Inherited",
      "name": "glossary"
    },
    {
      "args": {
        "1": "pl",
        "2": "zlw-opl",
        "3": "-em",
        "4": "",
        "5": "",
        "g": "",
        "g2": "",
        "g3": "",
        "id": "",
        "lit": "",
        "nocat": "",
        "pos": "",
        "sc": "",
        "sort": "",
        "tr": "",
        "ts": ""
      },
      "expansion": "Old Polish -em",
      "name": "inh"
    },
    {
      "args": {
        "1": "pl",
        "2": "zlw-opl",
        "3": "-em"
      },
      "expansion": "Inherited from Old Polish -em",
      "name": "inh+"
    },
    {
      "args": {
        "1": "pl",
        "2": "sla-pro",
        "3": "",
        "4": "*-emь/-ъ̀mь/-ь̀mь"
      },
      "expansion": "Proto-Slavic *-emь/-ъ̀mь/-ь̀mь",
      "name": "inh"
    }
  ],
  "etymology_text": "Etymology tree\nProto-Slavic *-emь\nProto-Slavic *-ъ̀mь\nProto-Slavic *-ь̀mь\nOld Polish -em\nPolish -em\nInherited from Old Polish -em, from Proto-Slavic *-emь/-ъ̀mь/-ь̀mь.",
  "forms": [
    {
      "form": "-iem",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "pl",
        "2": "suffix"
      },
      "expansion": "-em",
      "name": "head"
    }
  ],
  "hyphenation": [
    "-em"
  ],
  "hyphenations": [
    {
      "parts": [
        "",
        "em"
      ]
    }
  ],
  "lang": "Polish",
  "lang_code": "pl",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        "Pages using etymon with no ID",
        "Pages with 14 entries",
        "Pages with entries",
        "Pages with etymology trees",
        "Pages with inline etymon for redlinks",
        "Polish 1-syllable words",
        "Polish entries with etymology trees",
        "Polish entries with incorrect language header",
        "Polish lemmas",
        "Polish suffixes",
        "Polish terms derived from Old Polish",
        "Polish terms derived from Proto-Slavic",
        "Polish terms inherited from Old Polish",
        "Polish terms inherited from Proto-Slavic",
        "Polish terms with IPA pronunciation",
        "Polish terms with audio pronunciation",
        "Rhymes:Polish/ɛm",
        "Rhymes:Polish/ɛm/1 syllable"
      ],
      "glosses": [
        "forms the instrumental singular of nouns of declension types: masculine I, II, III, IV, V; neuter I, II, III, IV, V"
      ],
      "links": [
        [
          "instrumental",
          "Appendix:Glossary#instrumental_case"
        ],
        [
          "singular",
          "Appendix:Glossary#singular_number"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ɛm/"
    },
    {
      "rhymes": "-ɛm"
    }
  ],
  "word": "-em"
}