"N99" meaning in English

{
  "coordinate_terms": [
    {
      "_dis1": "50 50",
      "word": "R99"
    },
    {
      "_dis1": "50 50",
      "word": "P99 (99% filtration)"
    },
    {
      "_dis1": "50 50",
      "word": "R100"
    },
    {
      "_dis1": "50 50",
      "word": "P100"
    },
    {
      "_dis1": "50 50",
      "word": "N100 (99.97% filtration)"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "Not resistant to oil particles with 99% filtration efficiency"
      },
      "expansion": "Initialism of Not resistant to oil particles with 99% filtration efficiency",
      "name": "initialism"
    }
  ],
  "etymology_text": "From Initialism of Not resistant to oil particles with 99% filtration efficiency in NIOSH air filtration ratings.",
  "forms": [
    {
      "form": "N99s",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "N99 (countable and uncountable, plural N99s)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "_dis1": "50 50",
      "english": "oil-resistant filter standard",
      "word": "R95"
    },
    {
      "_dis1": "50 50",
      "english": "oil-proof filter standard",
      "word": "P95"
    }
  ],
  "senses": [
    {
      "categories": [],
      "glosses": [
        "N99; Ellipsis of NIOSH N99.",
        "N99 standard"
      ],
      "id": "en-N99-en-noun-WZiODRXu",
      "links": [
        [
          "N99",
          "N99#Translingual"
        ],
        [
          "NIOSH",
          "NIOSH#English"
        ]
      ],
      "raw_glosses": [
        "N99; Ellipsis of NIOSH N99.",
        "(uncountable) N99 standard"
      ],
      "tags": [
        "uncountable"
      ]
    },
    {
      "categories": [],
      "glosses": [
        "N99; Ellipsis of NIOSH N99.",
        "N99 filter"
      ],
      "id": "en-N99-en-noun-3CALhzx0",
      "links": [
        [
          "N99",
          "N99#Translingual"
        ],
        [
          "NIOSH",
          "NIOSH#English"
        ]
      ],
      "raw_glosses": [
        "N99; Ellipsis of NIOSH N99.",
        "(countable) N99 filter"
      ],
      "tags": [
        "countable"
      ]
    }
  ],
  "wikipedia": [
    "en:NIOSH air filtration rating"
  ],
  "word": "N99"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English initialisms",
    "English lemmas",
    "English nouns",
    "English terms spelled with numbers",
    "English uncountable nouns",
    "English words without vowels",
    "Pages with 2 entries",
    "Pages with entries"
  ],
  "coordinate_terms": [
    {
      "word": "R99"
    },
    {
      "word": "P99 (99% filtration)"
    },
    {
      "word": "R100"
    },
    {
      "word": "P100"
    },
    {
      "word": "N100 (99.97% filtration)"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "Not resistant to oil particles with 99% filtration efficiency"
      },
      "expansion": "Initialism of Not resistant to oil particles with 99% filtration efficiency",
      "name": "initialism"
    }
  ],
  "etymology_text": "From Initialism of Not resistant to oil particles with 99% filtration efficiency in NIOSH air filtration ratings.",
  "forms": [
    {
      "form": "N99s",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "N99 (countable and uncountable, plural N99s)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "english": "oil-resistant filter standard",
      "word": "R95"
    },
    {
      "english": "oil-proof filter standard",
      "word": "P95"
    }
  ],
  "senses": [
    {
      "categories": [
        "English ellipses",
        "English uncountable nouns"
      ],
      "glosses": [
        "N99; Ellipsis of NIOSH N99.",
        "N99 standard"
      ],
      "links": [
        [
          "N99",
          "N99#Translingual"
        ],
        [
          "NIOSH",
          "NIOSH#English"
        ]
      ],
      "raw_glosses": [
        "N99; Ellipsis of NIOSH N99.",
        "(uncountable) N99 standard"
      ],
      "tags": [
        "uncountable"
      ]
    },
    {
      "categories": [
        "English countable nouns",
        "English ellipses"
      ],
      "glosses": [
        "N99; Ellipsis of NIOSH N99.",
        "N99 filter"
      ],
      "links": [
        [
          "N99",
          "N99#Translingual"
        ],
        [
          "NIOSH",
          "NIOSH#English"
        ]
      ],
      "raw_glosses": [
        "N99; Ellipsis of NIOSH N99.",
        "(countable) N99 filter"
      ],
      "tags": [
        "countable"
      ]
    }
  ],
  "wikipedia": [
    "en:NIOSH air filtration rating"
  ],
  "word": "N99"
}