"undercomplete" meaning in English

{
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        "2": "under",
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      "expansion": "under- + complete",
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  ],
  "etymology_text": "under- + complete",
  "head_templates": [
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      "expansion": "undercomplete (not comparable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
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          "name": "Mathematics",
          "orig": "en:Mathematics",
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          "ref": "2015, Ahmed Hefny, Deanna Needell, Aaditya Ramdas, “Rows vs. Columns: Randomized Kaczmarz or Gauss-Seidel for Ridge Regression”, in arXiv",
          "text": "Recent work unified the analysis of these algorithms for the overcomplete and undercomplete systems, showing convergence to the ordinary least squares (OLS) solution and the minimum Euclidean norm solution respectively.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Describing a frame (in linear algebra) having a set of functions less than a basis"
      ],
      "id": "en-undercomplete-en-adj-k25RFd9e",
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          "linear algebra",
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        ],
        [
          "functions",
          "functions"
        ],
        [
          "basis",
          "basis"
        ]
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      "raw_glosses": [
        "(mathematics) Describing a frame (in linear algebra) having a set of functions less than a basis"
      ],
      "related": [
        {
          "word": "overcomplete"
        }
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "mathematics",
        "sciences"
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    }
  ],
  "word": "undercomplete"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "under",
        "3": "complete"
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      "expansion": "under- + complete",
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  ],
  "etymology_text": "under- + complete",
  "head_templates": [
    {
      "args": {
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      "expansion": "undercomplete (not comparable)",
      "name": "en-adj"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "related": [
    {
      "word": "overcomplete"
    }
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        }
      ],
      "glosses": [
        "Describing a frame (in linear algebra) having a set of functions less than a basis"
      ],
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          "frame",
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        ],
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          "functions",
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        ],
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          "basis",
          "basis"
        ]
      ],
      "raw_glosses": [
        "(mathematics) Describing a frame (in linear algebra) having a set of functions less than a basis"
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "mathematics",
        "sciences"
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    }
  ],
  "word": "undercomplete"
}