"self-mastery" meaning in English

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  "etymology_text": "Etymology tree\nProto-Indo-European *swé?\nProto-Indo-European *selbʰ-der.\nProto-Germanic *selbaz\nOld English self\nOld English self-\nMiddle English self-\nEnglish self-\nEnglish mastery\nEnglish self-mastery\nFrom self- + mastery.",
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      "expansion": "self-mastery (uncountable)",
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  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        {
          "word": "undisciplinedness"
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      "coordinate_terms": [
        {
          "word": "self-awareness"
        },
        {
          "word": "self-criticism"
        }
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      "examples": [
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          "text": "Near-synonym: willpower"
        },
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          "text": "Self-mastery matters for everyone.",
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      "glosses": [
        "The conscious control of one's behaviour."
      ],
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      "links": [
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          "conscious",
          "conscious"
        ],
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          "control",
          "control"
        ],
        [
          "behaviour",
          "behaviour"
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      ],
      "synonyms": [
        {
          "word": "self-command"
        },
        {
          "word": "self-control"
        },
        {
          "word": "self-discipline"
        },
        {
          "word": "self-regulation"
        },
        {
          "word": "willpower"
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      "translations": [
        {
          "code": "hi",
          "lang": "Hindi",
          "lang_code": "hi",
          "roman": "ātmasãyam",
          "sense": "conscious control of one's own behaviour",
          "tags": [
            "masculine"
          ],
          "word": "आत्मसंयम"
        },
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          "lang_code": "es",
          "sense": "conscious control of one's own behaviour",
          "tags": [
            "masculine"
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          "word": "autodominio"
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  "word": "self-mastery"
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  "etymology_text": "Etymology tree\nProto-Indo-European *swé?\nProto-Indo-European *selbʰ-der.\nProto-Germanic *selbaz\nOld English self\nOld English self-\nMiddle English self-\nEnglish self-\nEnglish mastery\nEnglish self-mastery\nFrom self- + mastery.",
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  "lang_code": "en",
  "pos": "noun",
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          "word": "undisciplinedness"
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          "text": "Self-mastery matters for everyone.",
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      "glosses": [
        "The conscious control of one's behaviour."
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          "word": "self-command"
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          "word": "self-control"
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          "word": "self-discipline"
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          "word": "self-regulation"
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          "word": "willpower"
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    {
      "code": "hi",
      "lang": "Hindi",
      "lang_code": "hi",
      "roman": "ātmasãyam",
      "sense": "conscious control of one's own behaviour",
      "tags": [
        "masculine"
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      "word": "आत्मसंयम"
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  "word": "self-mastery"
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