"substudy" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "sub",
        "3": "study"
      },
      "expansion": "sub- + study",
      "name": "prefix"
    }
  ],
  "etymology_text": "From sub- + study.",
  "forms": [
    {
      "form": "substudies",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "substudy (plural substudies)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "A subset of a study"
      ],
      "id": "en-substudy-en-noun-vY25252H",
      "links": [
        [
          "subset",
          "subset"
        ],
        [
          "study",
          "study"
        ]
      ]
    },
    {
      "categories": [
        {
          "_dis": "36 64",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "29 71",
          "kind": "other",
          "name": "English terms prefixed with sub-",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "26 74",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "13 87",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "A subordinate study"
      ],
      "id": "en-substudy-en-noun-uxm36-4e",
      "links": [
        [
          "subordinate",
          "subordinate"
        ]
      ]
    }
  ],
  "word": "substudy"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English nouns",
    "English terms prefixed with sub-",
    "Pages with 1 entry",
    "Pages with entries"
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "sub",
        "3": "study"
      },
      "expansion": "sub- + study",
      "name": "prefix"
    }
  ],
  "etymology_text": "From sub- + study.",
  "forms": [
    {
      "form": "substudies",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "substudy (plural substudies)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "A subset of a study"
      ],
      "links": [
        [
          "subset",
          "subset"
        ],
        [
          "study",
          "study"
        ]
      ]
    },
    {
      "glosses": [
        "A subordinate study"
      ],
      "links": [
        [
          "subordinate",
          "subordinate"
        ]
      ]
    }
  ],
  "word": "substudy"
}