"-er" meaning in Old French

{
  "etymology_number": 1,
  "etymology_templates": [
    {
      "args": {
        "1": "fro",
        "2": "la",
        "3": "-āre"
      },
      "expansion": "Latin -āre",
      "name": "inh"
    }
  ],
  "etymology_text": "From Latin -āre.",
  "head_templates": [
    {
      "args": {
        "1": "fro",
        "2": "suffix"
      },
      "expansion": "-er",
      "name": "head"
    }
  ],
  "lang": "Old French",
  "lang_code": "fro",
  "pos": "suffix",
  "senses": [
    {
      "alt_of": [
        {
          "word": "-ier"
        },
        {
          "word": "verbal suffix"
        }
      ],
      "glosses": [
        "Alternative form of -ier, verbal suffix"
      ],
      "id": "en--er-fro-suffix-vtmPK8SD",
      "links": [
        [
          "-ier",
          "-ier#Old French"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative",
        "morpheme"
      ]
    }
  ],
  "word": "-er"
}

{
  "etymology_number": 2,
  "etymology_templates": [
    {
      "args": {
        "1": "fro",
        "2": "la",
        "3": "-ārius"
      },
      "expansion": "Latin -ārius",
      "name": "inh"
    }
  ],
  "etymology_text": "From Latin -ārius.",
  "head_templates": [
    {
      "args": {
        "1": "fro",
        "2": "suffix"
      },
      "expansion": "-er",
      "name": "head"
    }
  ],
  "lang": "Old French",
  "lang_code": "fro",
  "pos": "suffix",
  "senses": [
    {
      "alt_of": [
        {
          "word": "-ier"
        },
        {
          "word": "suffix indicating a profession"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Anglo-Norman",
          "parents": [],
          "source": "w"
        },
        {
          "_dis": "28 72",
          "kind": "other",
          "name": "Old French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "text": "falconer, fauconer\nfalconer",
          "type": "example"
        }
      ],
      "glosses": [
        "Alternative form of -ier, suffix indicating a profession"
      ],
      "id": "en--er-fro-suffix-OMYz~0gU",
      "links": [
        [
          "-ier",
          "-ier#Old French"
        ]
      ],
      "raw_glosses": [
        "(chiefly Anglo-Norman) Alternative form of -ier, suffix indicating a profession"
      ],
      "tags": [
        "Anglo-Norman",
        "alt-of",
        "alternative",
        "morpheme"
      ]
    }
  ],
  "word": "-er"
}

{
  "categories": [
    "Old French entries with incorrect language header",
    "Old French lemmas",
    "Old French suffixes",
    "Old French terms derived from Latin",
    "Old French terms inherited from Latin",
    "Pages with raw sortkeys"
  ],
  "etymology_number": 1,
  "etymology_templates": [
    {
      "args": {
        "1": "fro",
        "2": "la",
        "3": "-āre"
      },
      "expansion": "Latin -āre",
      "name": "inh"
    }
  ],
  "etymology_text": "From Latin -āre.",
  "head_templates": [
    {
      "args": {
        "1": "fro",
        "2": "suffix"
      },
      "expansion": "-er",
      "name": "head"
    }
  ],
  "lang": "Old French",
  "lang_code": "fro",
  "pos": "suffix",
  "senses": [
    {
      "alt_of": [
        {
          "word": "-ier"
        },
        {
          "word": "verbal suffix"
        }
      ],
      "glosses": [
        "Alternative form of -ier, verbal suffix"
      ],
      "links": [
        [
          "-ier",
          "-ier#Old French"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative",
        "morpheme"
      ]
    }
  ],
  "word": "-er"
}

{
  "categories": [
    "Old French entries with incorrect language header",
    "Old French lemmas",
    "Old French suffixes",
    "Old French terms derived from Latin",
    "Old French terms inherited from Latin",
    "Pages with raw sortkeys"
  ],
  "etymology_number": 2,
  "etymology_templates": [
    {
      "args": {
        "1": "fro",
        "2": "la",
        "3": "-ārius"
      },
      "expansion": "Latin -ārius",
      "name": "inh"
    }
  ],
  "etymology_text": "From Latin -ārius.",
  "head_templates": [
    {
      "args": {
        "1": "fro",
        "2": "suffix"
      },
      "expansion": "-er",
      "name": "head"
    }
  ],
  "lang": "Old French",
  "lang_code": "fro",
  "pos": "suffix",
  "senses": [
    {
      "alt_of": [
        {
          "word": "-ier"
        },
        {
          "word": "suffix indicating a profession"
        }
      ],
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        "Old French terms with usage examples"
      ],
      "examples": [
        {
          "text": "falconer, fauconer\nfalconer",
          "type": "example"
        }
      ],
      "glosses": [
        "Alternative form of -ier, suffix indicating a profession"
      ],
      "links": [
        [
          "-ier",
          "-ier#Old French"
        ]
      ],
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        "(chiefly Anglo-Norman) Alternative form of -ier, suffix indicating a profession"
      ],
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        "Anglo-Norman",
        "alt-of",
        "alternative",
        "morpheme"
      ]
    }
  ],
  "word": "-er"
}