"an" meaning in Ido

{
  "etymology_templates": [
    {
      "args": {
        "1": "io",
        "2": "en",
        "3": "on"
      },
      "expansion": "English on",
      "name": "bor"
    },
    {
      "args": {
        "1": "io",
        "2": "de",
        "3": "an"
      },
      "expansion": "German an",
      "name": "bor"
    },
    {
      "args": {
        "1": "on",
        "2": "",
        "3": "an"
      },
      "expansion": "Borrowed from English on, German an.",
      "name": "io-bor"
    },
    {
      "args": {
        "1": "759",
        "p": "659",
        "vol": "5"
      },
      "expansion": "Decision no. 759, Progreso V.",
      "name": "progreso"
    }
  ],
  "etymology_text": "Borrowed from English on, German an. Decision no. 759, Progreso V.",
  "head_templates": [
    {
      "args": {
        "1": "io",
        "2": "prepositions"
      },
      "expansion": "an",
      "name": "head"
    }
  ],
  "lang": "Ido",
  "lang_code": "io",
  "pos": "prep",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Ido entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Ido prepositions",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Ido terms approved in Progreso V",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 82 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "derived": [
        {
          "english": "back to back",
          "word": "dorso an dorso"
        },
        {
          "word": "an-"
        }
      ],
      "examples": [
        {
          "english": "I hung paintings on the wall.",
          "text": "Me pendis pikturi an la parieto.",
          "type": "example"
        }
      ],
      "glosses": [
        "at, on (indicates contiguity, juxtaposition)"
      ],
      "id": "en-an-io-prep-GU8oYD8B",
      "links": [
        [
          "at",
          "at"
        ],
        [
          "on",
          "on"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/an/"
    }
  ],
  "word": "an"
}

{
  "categories": [
    "Pages with 82 entries",
    "Pages with entries"
  ],
  "derived": [
    {
      "english": "back to back",
      "word": "dorso an dorso"
    },
    {
      "word": "an-"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "io",
        "2": "en",
        "3": "on"
      },
      "expansion": "English on",
      "name": "bor"
    },
    {
      "args": {
        "1": "io",
        "2": "de",
        "3": "an"
      },
      "expansion": "German an",
      "name": "bor"
    },
    {
      "args": {
        "1": "on",
        "2": "",
        "3": "an"
      },
      "expansion": "Borrowed from English on, German an.",
      "name": "io-bor"
    },
    {
      "args": {
        "1": "759",
        "p": "659",
        "vol": "5"
      },
      "expansion": "Decision no. 759, Progreso V.",
      "name": "progreso"
    }
  ],
  "etymology_text": "Borrowed from English on, German an. Decision no. 759, Progreso V.",
  "head_templates": [
    {
      "args": {
        "1": "io",
        "2": "prepositions"
      },
      "expansion": "an",
      "name": "head"
    }
  ],
  "lang": "Ido",
  "lang_code": "io",
  "pos": "prep",
  "senses": [
    {
      "categories": [
        "Ido entries with incorrect language header",
        "Ido lemmas",
        "Ido prepositions",
        "Ido terms approved in Progreso V",
        "Ido terms borrowed from English",
        "Ido terms borrowed from German",
        "Ido terms derived from English",
        "Ido terms derived from German",
        "Ido terms with IPA pronunciation",
        "Ido terms with usage examples",
        "Pages with 82 entries",
        "Pages with entries"
      ],
      "examples": [
        {
          "english": "I hung paintings on the wall.",
          "text": "Me pendis pikturi an la parieto.",
          "type": "example"
        }
      ],
      "glosses": [
        "at, on (indicates contiguity, juxtaposition)"
      ],
      "links": [
        [
          "at",
          "at"
        ],
        [
          "on",
          "on"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/an/"
    }
  ],
  "word": "an"
}