"self-activity" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "self",
        "3": "activity"
      },
      "expansion": "self- + activity",
      "name": "prefix"
    }
  ],
  "etymology_text": "self- + activity",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "self-activity (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms prefixed with self-",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1692, Robert Boyle, A Confutation of Atheism from the Structure and Origin of Human Bodies",
          "text": "If it can intrinsically stir itself […] it must have a principle of self-activity which is life and sense.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Self-motion or the power of moving one's self or itself without foreign or external aid."
      ],
      "id": "en-self-activity-en-noun-oqGq-ovj",
      "links": [
        [
          "Self-motion",
          "self-motion"
        ],
        [
          "moving",
          "move"
        ]
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "self-activity"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "self",
        "3": "activity"
      },
      "expansion": "self- + activity",
      "name": "prefix"
    }
  ],
  "etymology_text": "self- + activity",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "self-activity (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms prefixed with self-",
        "English terms with quotations",
        "English uncountable nouns"
      ],
      "examples": [
        {
          "ref": "1692, Robert Boyle, A Confutation of Atheism from the Structure and Origin of Human Bodies",
          "text": "If it can intrinsically stir itself […] it must have a principle of self-activity which is life and sense.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Self-motion or the power of moving one's self or itself without foreign or external aid."
      ],
      "links": [
        [
          "Self-motion",
          "self-motion"
        ],
        [
          "moving",
          "move"
        ]
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "self-activity"
}