"semi-period" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "semi",
        "3": "period"
      },
      "expansion": "semi- + period",
      "name": "prefix"
    }
  ],
  "etymology_text": "From semi- + period.",
  "forms": [
    {
      "form": "semi-periods",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "semi-period (plural semi-periods)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
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          "source": "w"
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          "name": "English terms prefixed with semi-",
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          "source": "w"
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Physics",
          "orig": "en:Physics",
          "parents": [
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Half of the period of a wave etc; typically the time taken for part of a wave to be replaced by a similar part that is out of phase."
      ],
      "id": "en-semi-period-en-noun-zEEQZyhx",
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "period",
          "period"
        ],
        [
          "wave",
          "wave"
        ]
      ],
      "raw_glosses": [
        "(physics) Half of the period of a wave etc; typically the time taken for part of a wave to be replaced by a similar part that is out of phase."
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "word": "semi-period"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "semi",
        "3": "period"
      },
      "expansion": "semi- + period",
      "name": "prefix"
    }
  ],
  "etymology_text": "From semi- + period.",
  "forms": [
    {
      "form": "semi-periods",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "semi-period (plural semi-periods)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
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        "English nouns",
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        "en:Physics"
      ],
      "glosses": [
        "Half of the period of a wave etc; typically the time taken for part of a wave to be replaced by a similar part that is out of phase."
      ],
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "period",
          "period"
        ],
        [
          "wave",
          "wave"
        ]
      ],
      "raw_glosses": [
        "(physics) Half of the period of a wave etc; typically the time taken for part of a wave to be replaced by a similar part that is out of phase."
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "word": "semi-period"
}