"-ni" meaning in Old Irish

{
  "etymology_templates": [
    {
      "args": {
        "1": "sga",
        "2": "cel-pro",
        "3": "*snīs",
        "4": "",
        "5": "we"
      },
      "expansion": "Proto-Celtic *snīs (“we”)",
      "name": "inh"
    },
    {
      "args": {
        "1": "cy",
        "2": "ni"
      },
      "expansion": "Welsh ni",
      "name": "cog"
    }
  ],
  "etymology_text": "From Proto-Celtic *snīs (“we”) (compare Welsh ni).",
  "head_templates": [
    {
      "args": {
        "1": "sga",
        "2": "suffix",
        "cat2": "emphatic suffixes",
        "cat3": "",
        "g": "",
        "g2": ""
      },
      "expansion": "-ni",
      "name": "head"
    },
    {
      "args": {
        "1": "e"
      },
      "expansion": "-ni",
      "name": "sga-suffix"
    }
  ],
  "lang": "Old Irish",
  "lang_code": "sga",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Old Irish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "1st person plural emphatic suffix"
      ],
      "id": "en--ni-sga-suffix-RvN~PFtH",
      "related": [
        {
          "word": "1 sg"
        },
        {
          "word": "-se"
        },
        {
          "word": "-sa"
        },
        {
          "word": "2 sg"
        },
        {
          "word": "-siu"
        },
        {
          "word": "-so"
        },
        {
          "word": "-su"
        },
        {
          "word": "3 sg. m.n."
        },
        {
          "word": "-som"
        },
        {
          "word": "-sem"
        },
        {
          "word": "-sium"
        },
        {
          "word": "-sum"
        },
        {
          "word": "-sam"
        },
        {
          "word": "3 sg. f."
        },
        {
          "word": "-si"
        },
        {
          "word": "1 pl"
        },
        {
          "word": "-nai"
        },
        {
          "word": "-sni"
        },
        {
          "word": "2 pl"
        },
        {
          "word": "3 pl"
        },
        {
          "word": "Emphatic suffixes are added to nouns modified by a possessive determiner to emphasize the possessor"
        },
        {
          "word": "to verbs"
        },
        {
          "word": "predicate adjectives"
        },
        {
          "word": "and predicate nouns to emphasize the subject"
        },
        {
          "word": "and to inflected prepositions to emphasize the object"
        }
      ],
      "synonyms": [
        {
          "word": "-nai"
        },
        {
          "word": "-sni"
        }
      ],
      "tags": [
        "emphatic",
        "first-person",
        "morpheme",
        "plural",
        "suffix"
      ]
    }
  ],
  "word": "-ni"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "sga",
        "2": "cel-pro",
        "3": "*snīs",
        "4": "",
        "5": "we"
      },
      "expansion": "Proto-Celtic *snīs (“we”)",
      "name": "inh"
    },
    {
      "args": {
        "1": "cy",
        "2": "ni"
      },
      "expansion": "Welsh ni",
      "name": "cog"
    }
  ],
  "etymology_text": "From Proto-Celtic *snīs (“we”) (compare Welsh ni).",
  "head_templates": [
    {
      "args": {
        "1": "sga",
        "2": "suffix",
        "cat2": "emphatic suffixes",
        "cat3": "",
        "g": "",
        "g2": ""
      },
      "expansion": "-ni",
      "name": "head"
    },
    {
      "args": {
        "1": "e"
      },
      "expansion": "-ni",
      "name": "sga-suffix"
    }
  ],
  "lang": "Old Irish",
  "lang_code": "sga",
  "pos": "suffix",
  "related": [
    {
      "word": "1 sg"
    },
    {
      "word": "-se"
    },
    {
      "word": "-sa"
    },
    {
      "word": "2 sg"
    },
    {
      "word": "-siu"
    },
    {
      "word": "-so"
    },
    {
      "word": "-su"
    },
    {
      "word": "3 sg. m.n."
    },
    {
      "word": "-som"
    },
    {
      "word": "-sem"
    },
    {
      "word": "-sium"
    },
    {
      "word": "-sum"
    },
    {
      "word": "-sam"
    },
    {
      "word": "3 sg. f."
    },
    {
      "word": "-si"
    },
    {
      "word": "1 pl"
    },
    {
      "word": "-nai"
    },
    {
      "word": "-sni"
    },
    {
      "word": "2 pl"
    },
    {
      "word": "3 pl"
    },
    {
      "word": "Emphatic suffixes are added to nouns modified by a possessive determiner to emphasize the possessor"
    },
    {
      "word": "to verbs"
    },
    {
      "word": "predicate adjectives"
    },
    {
      "word": "and predicate nouns to emphasize the subject"
    },
    {
      "word": "and to inflected prepositions to emphasize the object"
    }
  ],
  "senses": [
    {
      "categories": [
        "Old Irish emphatic suffixes",
        "Old Irish entries with incorrect language header",
        "Old Irish lemmas",
        "Old Irish suffixes",
        "Old Irish terms derived from Proto-Celtic",
        "Old Irish terms inherited from Proto-Celtic"
      ],
      "glosses": [
        "1st person plural emphatic suffix"
      ],
      "tags": [
        "emphatic",
        "first-person",
        "morpheme",
        "plural",
        "suffix"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "-nai"
    },
    {
      "word": "-sni"
    }
  ],
  "word": "-ni"
}