"προ" meaning in Greek

{
  "forms": [
    {
      "form": "pro",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "el",
        "2": "preposition",
        "head": "",
        "sort": ""
      },
      "expansion": "προ • (pro)",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "προ • (pro)",
      "name": "el-prep"
    }
  ],
  "lang": "Greek",
  "lang_code": "el",
  "pos": "prep",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Greek entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Greek prepositions",
          "parents": [],
          "source": "w"
        }
      ],
      "derived": [
        {
          "english": "before noon, ante meridiem",
          "roman": "pro mesimvrías",
          "word": "προ μεσημβρίας"
        },
        {
          "english": "before the Common Era, BC",
          "roman": "pro Koinís Epochís",
          "word": "προ Κοινής Εποχής"
        }
      ],
      "glosses": [
        "before"
      ],
      "id": "en-προ-el-prep-bbfYA-dP",
      "links": [
        [
          "before",
          "before"
        ]
      ],
      "tags": [
        "with-genitive"
      ]
    }
  ],
  "word": "προ"
}

{
  "derived": [
    {
      "english": "before noon, ante meridiem",
      "roman": "pro mesimvrías",
      "word": "προ μεσημβρίας"
    },
    {
      "english": "before the Common Era, BC",
      "roman": "pro Koinís Epochís",
      "word": "προ Κοινής Εποχής"
    }
  ],
  "forms": [
    {
      "form": "pro",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "el",
        "2": "preposition",
        "head": "",
        "sort": ""
      },
      "expansion": "προ • (pro)",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "προ • (pro)",
      "name": "el-prep"
    }
  ],
  "lang": "Greek",
  "lang_code": "el",
  "pos": "prep",
  "senses": [
    {
      "categories": [
        "Greek entries with incorrect language header",
        "Greek lemmas",
        "Greek prepositions"
      ],
      "glosses": [
        "before"
      ],
      "links": [
        [
          "before",
          "before"
        ]
      ],
      "tags": [
        "with-genitive"
      ]
    }
  ],
  "word": "προ"
}