"-en-" meaning in Dutch

{
  "head_templates": [
    {
      "args": {
        "1": "nl",
        "2": "interfix"
      },
      "expansion": "-en-",
      "name": "head"
    }
  ],
  "lang": "Dutch",
  "lang_code": "nl",
  "pos": "interfix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Dutch entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Dutch interfixes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 4 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "paard (“horse”) + -en- + kracht (“power”) → paardenkracht (“horsepower”)",
          "type": "example"
        },
        {
          "text": "tulp (“tulip”) + -en- + bol (“bulb”) → tulpenbol (“tulip bulb”)",
          "type": "example"
        }
      ],
      "glosses": [
        "genitival interfix indicating that the former element is a characteristic of the latter; sometimes connotes countability or plurality"
      ],
      "id": "en--en--nl-interfix-E1nl-4qb",
      "related": [
        {
          "word": "-e-"
        },
        {
          "word": "-s-"
        }
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ə(n)/"
    }
  ],
  "word": "-en-"
}

{
  "head_templates": [
    {
      "args": {
        "1": "nl",
        "2": "interfix"
      },
      "expansion": "-en-",
      "name": "head"
    }
  ],
  "lang": "Dutch",
  "lang_code": "nl",
  "pos": "interfix",
  "related": [
    {
      "word": "-e-"
    },
    {
      "word": "-s-"
    }
  ],
  "senses": [
    {
      "categories": [
        "Dutch entries with incorrect language header",
        "Dutch interfixes",
        "Dutch lemmas",
        "Pages with 4 entries",
        "Pages with entries"
      ],
      "examples": [
        {
          "text": "paard (“horse”) + -en- + kracht (“power”) → paardenkracht (“horsepower”)",
          "type": "example"
        },
        {
          "text": "tulp (“tulip”) + -en- + bol (“bulb”) → tulpenbol (“tulip bulb”)",
          "type": "example"
        }
      ],
      "glosses": [
        "genitival interfix indicating that the former element is a characteristic of the latter; sometimes connotes countability or plurality"
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ə(n)/"
    }
  ],
  "word": "-en-"
}