"interlunation" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "inter",
        "3": "lunation"
      },
      "expansion": "inter- + lunation",
      "name": "prefix"
    }
  ],
  "etymology_text": "inter- + lunation",
  "forms": [
    {
      "form": "interlunations",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "interlunation (countable and uncountable, plural interlunations)",
      "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 inter-",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "The interlunar period; the dark time between the old moon and new moon phases."
      ],
      "id": "en-interlunation-en-noun-hnwkhPaa",
      "links": [
        [
          "interlunar",
          "interlunar"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "translations": [
        {
          "code": "ja",
          "lang": "Japanese",
          "roman": "mugetsu kikan",
          "sense": "interlunar period",
          "word": "無月期間"
        }
      ]
    }
  ],
  "word": "interlunation"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "inter",
        "3": "lunation"
      },
      "expansion": "inter- + lunation",
      "name": "prefix"
    }
  ],
  "etymology_text": "inter- + lunation",
  "forms": [
    {
      "form": "interlunations",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "interlunation (countable and uncountable, plural interlunations)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms prefixed with inter-",
        "English uncountable nouns"
      ],
      "glosses": [
        "The interlunar period; the dark time between the old moon and new moon phases."
      ],
      "links": [
        [
          "interlunar",
          "interlunar"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "translations": [
    {
      "code": "ja",
      "lang": "Japanese",
      "roman": "mugetsu kikan",
      "sense": "interlunar period",
      "word": "無月期間"
    }
  ],
  "word": "interlunation"
}