"first mover" meaning in English

{
  "forms": [
    {
      "form": "first movers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "first mover (plural first movers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Philosophy",
          "orig": "en:Philosophy",
          "parents": [
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "first-mover disadvantage"
        }
      ],
      "glosses": [
        "The initial agent that is the cause of all things; the prime mover."
      ],
      "id": "en-first_mover-en-noun-huTsb4rd",
      "links": [
        [
          "philosophy",
          "philosophy"
        ],
        [
          "initial",
          "initial"
        ],
        [
          "agent",
          "agent"
        ],
        [
          "cause",
          "cause"
        ],
        [
          "prime mover",
          "prime mover"
        ]
      ],
      "raw_glosses": [
        "(philosophy) The initial agent that is the cause of all things; the prime mover."
      ],
      "topics": [
        "human-sciences",
        "philosophy",
        "sciences"
      ]
    }
  ],
  "word": "first mover"
}

{
  "derived": [
    {
      "word": "first-mover disadvantage"
    }
  ],
  "forms": [
    {
      "form": "first movers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "first mover (plural first movers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:Philosophy"
      ],
      "glosses": [
        "The initial agent that is the cause of all things; the prime mover."
      ],
      "links": [
        [
          "philosophy",
          "philosophy"
        ],
        [
          "initial",
          "initial"
        ],
        [
          "agent",
          "agent"
        ],
        [
          "cause",
          "cause"
        ],
        [
          "prime mover",
          "prime mover"
        ]
      ],
      "raw_glosses": [
        "(philosophy) The initial agent that is the cause of all things; the prime mover."
      ],
      "topics": [
        "human-sciences",
        "philosophy",
        "sciences"
      ]
    }
  ],
  "word": "first mover"
}