"40k" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "40",
        "3": "k"
      },
      "expansion": "40 + k",
      "name": "compound"
    }
  ],
  "etymology_text": "From 40 + k. From 40,000, part of \"Warhammer 40,000\", referring to the future year where the game was set in.",
  "head_templates": [
    {
      "args": {},
      "expansion": "40k",
      "name": "en-proper noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Board games",
          "orig": "en:Board games",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Science fiction",
          "orig": "en:Science fiction",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Warhammer",
          "orig": "en:Warhammer",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Warhammer 40,000, a British tabletop military game set in a dystopian future Galaxy torn by war."
      ],
      "id": "en-40k-en-name-7W7lWi5Q",
      "links": [
        [
          "science fiction",
          "science fiction"
        ]
      ],
      "raw_glosses": [
        "(informal, slang, science fiction) Warhammer 40,000, a British tabletop military game set in a dystopian future Galaxy torn by war."
      ],
      "related": [
        {
          "word": "Warhammer"
        }
      ],
      "tags": [
        "informal",
        "slang"
      ],
      "topics": [
        "literature",
        "media",
        "publishing",
        "science-fiction"
      ],
      "wikipedia": [
        "Warhammer 40,000"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/fɔːtiː keɪ/",
      "tags": [
        "UK"
      ]
    },
    {
      "ipa": "[ˈfɔːtʰi kʰeɪ]",
      "tags": [
        "UK"
      ]
    },
    {
      "ipa": "/ˈfɔɹti keɪ/",
      "tags": [
        "General-American"
      ]
    },
    {
      "ipa": "[ˈfɔɹɾi kʰeɪ]",
      "tags": [
        "General-American"
      ]
    },
    {
      "rhymes": "-eɪ"
    }
  ],
  "word": "40k"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "40",
        "3": "k"
      },
      "expansion": "40 + k",
      "name": "compound"
    }
  ],
  "etymology_text": "From 40 + k. From 40,000, part of \"Warhammer 40,000\", referring to the future year where the game was set in.",
  "head_templates": [
    {
      "args": {},
      "expansion": "40k",
      "name": "en-proper noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "related": [
    {
      "word": "Warhammer"
    }
  ],
  "senses": [
    {
      "categories": [
        "English compound terms",
        "English entries with incorrect language header",
        "English informal terms",
        "English lemmas",
        "English proper nouns",
        "English slang",
        "English terms spelled with numbers",
        "English uncountable nouns",
        "English words without vowels",
        "Pages with 1 entry",
        "Pages with entries",
        "Rhymes:English/eɪ",
        "Rhymes:English/eɪ/3 syllables",
        "en:Board games",
        "en:Science fiction",
        "en:Warhammer"
      ],
      "glosses": [
        "Warhammer 40,000, a British tabletop military game set in a dystopian future Galaxy torn by war."
      ],
      "links": [
        [
          "science fiction",
          "science fiction"
        ]
      ],
      "raw_glosses": [
        "(informal, slang, science fiction) Warhammer 40,000, a British tabletop military game set in a dystopian future Galaxy torn by war."
      ],
      "tags": [
        "informal",
        "slang"
      ],
      "topics": [
        "literature",
        "media",
        "publishing",
        "science-fiction"
      ],
      "wikipedia": [
        "Warhammer 40,000"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/fɔːtiː keɪ/",
      "tags": [
        "UK"
      ]
    },
    {
      "ipa": "[ˈfɔːtʰi kʰeɪ]",
      "tags": [
        "UK"
      ]
    },
    {
      "ipa": "/ˈfɔɹti keɪ/",
      "tags": [
        "General-American"
      ]
    },
    {
      "ipa": "[ˈfɔɹɾi kʰeɪ]",
      "tags": [
        "General-American"
      ]
    },
    {
      "rhymes": "-eɪ"
    }
  ],
  "word": "40k"
}