"1-D" meaning in English

{
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      "expansion": "1-D (not comparable)",
      "name": "en-adj"
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "alt_of": [
        {
          "word": "one-dimensional"
        }
      ],
      "categories": [
        {
          "_dis": "46 54",
          "kind": "topical",
          "langcode": "en",
          "name": "Geometry",
          "orig": "en:Geometry",
          "parents": [
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            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
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          "source": "w+disamb"
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      ],
      "glosses": [
        "Initialism of one-dimensional."
      ],
      "id": "en-1-D-en-adj-Fdt4dXrh",
      "links": [
        [
          "one-dimensional",
          "one-dimensional#English"
        ]
      ],
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      ]
    }
  ],
  "word": "1-D"
}

{
  "head_templates": [
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      "args": {
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      "expansion": "1-D (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "6 94",
          "kind": "other",
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          "source": "w+disamb"
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          "_dis": "8 92",
          "kind": "other",
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          "parents": [],
          "source": "w+disamb"
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        {
          "_dis": "2 98",
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          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "46 54",
          "kind": "topical",
          "langcode": "en",
          "name": "Geometry",
          "orig": "en:Geometry",
          "parents": [
            "Mathematics",
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "A selective service class denoting that the registrant is already a reserve member of the armed forces or a student taking military training, as in ROTC or an accepted aviation cadet applicant."
      ],
      "id": "en-1-D-en-noun-tMY2vXbz",
      "links": [
        [
          "selective service",
          "w:Selective Service System"
        ],
        [
          "reserve",
          "reserve#English"
        ],
        [
          "armed forces",
          "armed forces#English"
        ],
        [
          "ROTC",
          "ROTC#English"
        ]
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "1-D"
}

{
  "categories": [
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    "English compound adjectives",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns",
    "English terms spelled with numbers",
    "English uncomparable adjectives",
    "English uncountable nouns",
    "English words without vowels",
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  "head_templates": [
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "alt_of": [
        {
          "word": "one-dimensional"
        }
      ],
      "categories": [
        "English initialisms"
      ],
      "glosses": [
        "Initialism of one-dimensional."
      ],
      "links": [
        [
          "one-dimensional",
          "one-dimensional#English"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "initialism",
        "not-comparable"
      ]
    }
  ],
  "word": "1-D"
}

{
  "categories": [
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    "English compound adjectives",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns",
    "English terms spelled with numbers",
    "English uncomparable adjectives",
    "English uncountable nouns",
    "English words without vowels",
    "Pages with 1 entry",
    "Pages with entries",
    "en:Geometry"
  ],
  "head_templates": [
    {
      "args": {
        "1": "-"
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      "expansion": "1-D (uncountable)",
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "A selective service class denoting that the registrant is already a reserve member of the armed forces or a student taking military training, as in ROTC or an accepted aviation cadet applicant."
      ],
      "links": [
        [
          "selective service",
          "w:Selective Service System"
        ],
        [
          "reserve",
          "reserve#English"
        ],
        [
          "armed forces",
          "armed forces#English"
        ],
        [
          "ROTC",
          "ROTC#English"
        ]
      ],
      "tags": [
        "uncountable"
      ]
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  "word": "1-D"
}