"pro" meaning in Volapük

{
  "head_templates": [
    {
      "args": {
        "1": "vo",
        "2": "preposition"
      },
      "expansion": "pro",
      "name": "head"
    }
  ],
  "lang": "Volapük",
  "lang_code": "vo",
  "pos": "prep",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 24 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Volapük entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Volapük prepositions",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "The past year has not been favorable for our movement.",
          "ref": "1938, “Pö yelacen”, in Volapükagased pro Nedänapükans, page 1:",
          "text": "Yel epasetiköl no ebinon bönik pro muf obsik.",
          "type": "quote"
        },
        {
          "english": "If we examine the existing auxiliary languages, we must admit that they are all indeed useful for the purpose.",
          "ref": "1938, “Ge lü Volapük!”, in Volapükagased pro Nedänapükans, pages 17-19:",
          "text": "If xamobs yufapükis dabinöl, täno mutobs dasevön, das ons valik jenöfo binons geboviks pro disein.",
          "type": "quote"
        }
      ],
      "glosses": [
        "for"
      ],
      "id": "en-pro-vo-prep-EMIrz0x2",
      "links": [
        [
          "for",
          "for"
        ]
      ]
    }
  ],
  "word": "pro"
}

{
  "head_templates": [
    {
      "args": {
        "1": "vo",
        "2": "preposition"
      },
      "expansion": "pro",
      "name": "head"
    }
  ],
  "lang": "Volapük",
  "lang_code": "vo",
  "pos": "prep",
  "senses": [
    {
      "categories": [
        "Pages with 24 entries",
        "Pages with entries",
        "Volapük entries with incorrect language header",
        "Volapük lemmas",
        "Volapük prepositions",
        "Volapük terms with quotations"
      ],
      "examples": [
        {
          "english": "The past year has not been favorable for our movement.",
          "ref": "1938, “Pö yelacen”, in Volapükagased pro Nedänapükans, page 1:",
          "text": "Yel epasetiköl no ebinon bönik pro muf obsik.",
          "type": "quote"
        },
        {
          "english": "If we examine the existing auxiliary languages, we must admit that they are all indeed useful for the purpose.",
          "ref": "1938, “Ge lü Volapük!”, in Volapükagased pro Nedänapükans, pages 17-19:",
          "text": "If xamobs yufapükis dabinöl, täno mutobs dasevön, das ons valik jenöfo binons geboviks pro disein.",
          "type": "quote"
        }
      ],
      "glosses": [
        "for"
      ],
      "links": [
        [
          "for",
          "for"
        ]
      ]
    }
  ],
  "word": "pro"
}