"Greek letter" meaning in English

{
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      "expansion": "Greek letter (not comparable)",
      "name": "en-adjective"
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "alt_of": [
        {
          "word": "Greek-letter"
        }
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      "categories": [
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          "kind": "other",
          "name": "American English",
          "parents": [],
          "source": "w"
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          "name": "English entries with incorrect language header",
          "parents": [
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      "examples": [
        {
          "ref": "1918, Kappa Alpha Theta, volume 33, page 358",
          "text": "Each Friday we held open house at the Young Women's Christian association for all Greek letter women who could come (if but for an hour) to sew for the French orphans.",
          "type": "quotation"
        },
        {
          "ref": "1928, Balfour Blue Book, page 2",
          "text": "The following national Greek letter fraternities and sororities, served officially by this Company, were listed in our 1927 Blue Book...",
          "type": "quotation"
        },
        {
          "ref": "1934, Kappa Sigma Fraternity, Caduceus, page 500",
          "text": "Other Greek letter house fires of importance here include the burning of the Pi Kappa Alpha house in the Christmas holidays of 1924 and the burning of the roof and second floor of the Delta Zeta house in the Spring of 1926.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative spelling of Greek-letter"
      ],
      "id": "en-Greek_letter-en-adj-XiPzECq5",
      "links": [
        [
          "Greek-letter",
          "Greek-letter#English"
        ]
      ],
      "raw_glosses": [
        "(US) Alternative spelling of Greek-letter"
      ],
      "tags": [
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        "alt-of",
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        "not-comparable"
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    }
  ],
  "word": "Greek letter"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "Greek letter (not comparable)",
      "name": "en-adjective"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "alt_of": [
        {
          "word": "Greek-letter"
        }
      ],
      "categories": [
        "American English",
        "English adjectives",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English terms with quotations",
        "English uncomparable adjectives",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "1918, Kappa Alpha Theta, volume 33, page 358",
          "text": "Each Friday we held open house at the Young Women's Christian association for all Greek letter women who could come (if but for an hour) to sew for the French orphans.",
          "type": "quotation"
        },
        {
          "ref": "1928, Balfour Blue Book, page 2",
          "text": "The following national Greek letter fraternities and sororities, served officially by this Company, were listed in our 1927 Blue Book...",
          "type": "quotation"
        },
        {
          "ref": "1934, Kappa Sigma Fraternity, Caduceus, page 500",
          "text": "Other Greek letter house fires of importance here include the burning of the Pi Kappa Alpha house in the Christmas holidays of 1924 and the burning of the roof and second floor of the Delta Zeta house in the Spring of 1926.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative spelling of Greek-letter"
      ],
      "links": [
        [
          "Greek-letter",
          "Greek-letter#English"
        ]
      ],
      "raw_glosses": [
        "(US) Alternative spelling of Greek-letter"
      ],
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    }
  ],
  "word": "Greek letter"
}