"критическая масса" meaning in Russe

{
  "categories": [
    {
      "kind": "other",
      "name": "Compositions en russe",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Déclinaisons manquantes en russe",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Locutions nominales en russe",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Russe",
      "orig": "russe",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Composé de критический et de масса."
  ],
  "lang": "Russe",
  "lang_code": "ru",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "raw_tags": [
    "Déclinaisons manquantes ou à compléter. (Ajouter)"
  ],
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en russe du nucléaire",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Masse critique."
      ],
      "id": "fr-критическая_масса-ru-noun-E2U5z1lT",
      "raw_tags": [
        "Nucléaire"
      ]
    }
  ],
  "tags": [
    "feminine"
  ],
  "word": "критическая масса"
}

{
  "categories": [
    "Compositions en russe",
    "Déclinaisons manquantes en russe",
    "Locutions nominales en russe",
    "russe"
  ],
  "etymology_texts": [
    "Composé de критический et de масса."
  ],
  "lang": "Russe",
  "lang_code": "ru",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "raw_tags": [
    "Déclinaisons manquantes ou à compléter. (Ajouter)"
  ],
  "senses": [
    {
      "categories": [
        "Lexique en russe du nucléaire"
      ],
      "glosses": [
        "Masse critique."
      ],
      "raw_tags": [
        "Nucléaire"
      ]
    }
  ],
  "tags": [
    "feminine"
  ],
  "word": "критическая масса"
}