"rhythm method" meaning in English

{
  "forms": [
    {
      "form": "rhythm methods",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "rhythm method (plural rhythm methods)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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          "kind": "other",
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          "source": "w"
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Birth control",
          "orig": "en:Birth control",
          "parents": [
            "Pregnancy",
            "Sex",
            "Body",
            "Gynaecology",
            "All topics",
            "Reproduction",
            "Female",
            "Medicine",
            "Fundamental",
            "Life",
            "Gender",
            "Biology",
            "Healthcare",
            "Nature",
            "Psychology",
            "Sociology",
            "Sciences",
            "Health",
            "Social sciences",
            "Society"
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          "source": "w"
        }
      ],
      "glosses": [
        "A method of natural birth control that involves counting days of a woman's menstrual cycle in order to determine when sexual intercourse is most or least likely to result in pregnancy."
      ],
      "id": "en-rhythm_method-en-noun-C6wxsBSC",
      "links": [
        [
          "birth control",
          "birth control"
        ],
        [
          "menstrual cycle",
          "menstrual cycle"
        ],
        [
          "sexual intercourse",
          "sexual intercourse"
        ]
      ],
      "synonyms": [
        {
          "word": "calendar method"
        },
        {
          "word": "Knaus-Ogino method"
        },
        {
          "word": "Vatican roulette"
        }
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "birth control method",
          "word": "rytmimenetelmä"
        }
      ],
      "wikipedia": [
        "rhythm method"
      ]
    }
  ],
  "word": "rhythm method"
}

{
  "forms": [
    {
      "form": "rhythm methods",
      "tags": [
        "plural"
      ]
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      "expansion": "rhythm method (plural rhythm methods)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "en:Birth control"
      ],
      "glosses": [
        "A method of natural birth control that involves counting days of a woman's menstrual cycle in order to determine when sexual intercourse is most or least likely to result in pregnancy."
      ],
      "links": [
        [
          "birth control",
          "birth control"
        ],
        [
          "menstrual cycle",
          "menstrual cycle"
        ],
        [
          "sexual intercourse",
          "sexual intercourse"
        ]
      ],
      "wikipedia": [
        "rhythm method"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "calendar method"
    },
    {
      "word": "Knaus-Ogino method"
    },
    {
      "word": "Vatican roulette"
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "birth control method",
      "word": "rytmimenetelmä"
    }
  ],
  "word": "rhythm method"
}