"protero-" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "ine-pro",
        "3": "*-teros"
      },
      "expansion": "",
      "name": "root"
    },
    {
      "args": {
        "1": "en",
        "2": "grc",
        "3": "πρότερος",
        "4": "",
        "5": "anterior"
      },
      "expansion": "Ancient Greek πρότερος (próteros, “anterior”)",
      "name": "der"
    }
  ],
  "etymology_text": "From Ancient Greek πρότερος (próteros, “anterior”).",
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prefix"
      },
      "expansion": "protero-",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prefix",
  "related": [
    {
      "_dis1": "0 0 0",
      "word": "proto-"
    },
    {
      "_dis1": "0 0 0",
      "english": "later, subsequent",
      "word": "meta-"
    }
  ],
  "senses": [
    {
      "categories": [
        {
          "_dis": "33 38 29",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "46 25 29",
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "35 33 32",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "First"
      ],
      "id": "en-protero--en-prefix-oVHOsXEa",
      "links": [
        [
          "First",
          "first"
        ]
      ],
      "synonyms": [
        {
          "_dis1": "100 0 0",
          "sense": "first",
          "word": "proto"
        }
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "categories": [
        {
          "_dis": "33 38 29",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "35 33 32",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "Earliest."
      ],
      "id": "en-protero--en-prefix-B-5nwWfN",
      "links": [
        [
          "Earliest",
          "earliest"
        ]
      ],
      "synonyms": [
        {
          "_dis1": "1 86 13",
          "sense": "earliest",
          "word": "eo-"
        }
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "categories": [
        {
          "_dis": "33 38 29",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "35 33 32",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "Early."
      ],
      "id": "en-protero--en-prefix-JGVcCRr~",
      "links": [
        [
          "Early",
          "early"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈpɹɒt(ə)ɹəʊ/",
      "tags": [
        "UK"
      ]
    }
  ],
  "word": "protero-"
}

{
  "categories": [
    "English entries with incorrect language header",
    "English lemmas",
    "English prefixes",
    "English terms derived from Ancient Greek",
    "English terms derived from Proto-Indo-European",
    "English terms derived from the Proto-Indo-European root *-teros",
    "Pages with 2 entries",
    "Pages with entries"
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "ine-pro",
        "3": "*-teros"
      },
      "expansion": "",
      "name": "root"
    },
    {
      "args": {
        "1": "en",
        "2": "grc",
        "3": "πρότερος",
        "4": "",
        "5": "anterior"
      },
      "expansion": "Ancient Greek πρότερος (próteros, “anterior”)",
      "name": "der"
    }
  ],
  "etymology_text": "From Ancient Greek πρότερος (próteros, “anterior”).",
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prefix"
      },
      "expansion": "protero-",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prefix",
  "related": [
    {
      "word": "proto-"
    },
    {
      "english": "later, subsequent",
      "word": "meta-"
    }
  ],
  "senses": [
    {
      "glosses": [
        "First"
      ],
      "links": [
        [
          "First",
          "first"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "glosses": [
        "Earliest."
      ],
      "links": [
        [
          "Earliest",
          "earliest"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "glosses": [
        "Early."
      ],
      "links": [
        [
          "Early",
          "early"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈpɹɒt(ə)ɹəʊ/",
      "tags": [
        "UK"
      ]
    }
  ],
  "synonyms": [
    {
      "sense": "first",
      "word": "proto"
    },
    {
      "sense": "earliest",
      "word": "eo-"
    }
  ],
  "word": "protero-"
}