"gioco a somma zero" meaning in Italian

{
  "forms": [
    {
      "form": "giochi a somma zero",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "gioco a somma zero m (plural giochi a somma zero)",
      "name": "it-noun"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Italian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "it",
          "name": "Game theory",
          "orig": "it:Game theory",
          "parents": [
            "Mathematics",
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "zero-sum game"
      ],
      "id": "en-gioco_a_somma_zero-it-noun-OCxIPSO1",
      "links": [
        [
          "game theory",
          "game theory"
        ],
        [
          "zero-sum game",
          "zero-sum game"
        ]
      ],
      "raw_glosses": [
        "(game theory) zero-sum game"
      ],
      "tags": [
        "masculine"
      ],
      "topics": [
        "computing",
        "engineering",
        "game-theory",
        "mathematics",
        "natural-sciences",
        "physical-sciences",
        "sciences"
      ]
    }
  ],
  "word": "gioco a somma zero"
}

{
  "forms": [
    {
      "form": "giochi a somma zero",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "gioco a somma zero m (plural giochi a somma zero)",
      "name": "it-noun"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Italian countable nouns",
        "Italian entries with incorrect language header",
        "Italian lemmas",
        "Italian masculine nouns",
        "Italian multiword terms",
        "Italian nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "it:Game theory"
      ],
      "glosses": [
        "zero-sum game"
      ],
      "links": [
        [
          "game theory",
          "game theory"
        ],
        [
          "zero-sum game",
          "zero-sum game"
        ]
      ],
      "raw_glosses": [
        "(game theory) zero-sum game"
      ],
      "tags": [
        "masculine"
      ],
      "topics": [
        "computing",
        "engineering",
        "game-theory",
        "mathematics",
        "natural-sciences",
        "physical-sciences",
        "sciences"
      ]
    }
  ],
  "word": "gioco a somma zero"
}