"昨月" meaning in Japanese

{
  "forms": [
    {
      "form": "昨月",
      "ruby": [
        [
          "昨",
          "さく"
        ],
        [
          "月",
          "げつ"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "sakugetsu",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "さくげつ"
      },
      "expansion": "昨(さく)月(げつ) • (sakugetsu)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "33 67",
          "kind": "other",
          "name": "Japanese terms read with on'yomi",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "100 0",
          "kind": "other",
          "langcode": "ja",
          "name": "Time",
          "orig": "ja:Time",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "coordinate_terms": [
        {
          "word": "来月"
        }
      ],
      "glosses": [
        "last month"
      ],
      "id": "en-昨月-ja-noun-aDFz6DhP",
      "links": [
        [
          "last",
          "last"
        ],
        [
          "month",
          "month"
        ]
      ],
      "raw_glosses": [
        "(rare) last month"
      ],
      "synonyms": [
        {
          "word": "前月"
        },
        {
          "word": "先月"
        },
        {
          "word": "去月"
        }
      ],
      "tags": [
        "rare"
      ]
    },
    {
      "categories": [
        {
          "_dis": "33 67",
          "kind": "other",
          "name": "Japanese entries with incorrect language header",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "33 67",
          "kind": "other",
          "name": "Japanese links with redundant alt parameters",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "33 67",
          "kind": "other",
          "name": "Japanese links with redundant wikilinks",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "33 67",
          "kind": "other",
          "name": "Japanese terms read with on'yomi",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "33 67",
          "kind": "other",
          "name": "Japanese terms with 2 kanji",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "12 88",
          "kind": "other",
          "name": "Japanese terms with non-redundant non-automated sortkeys",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "33 67",
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "33 67",
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "33 67",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "the moon of last night"
      ],
      "id": "en-昨月-ja-noun-MuKeDR03",
      "links": [
        [
          "moon",
          "moon"
        ],
        [
          "last night",
          "last night"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[sa̠kɯ̟ɡe̞t͡sɨ]"
    }
  ],
  "word": "昨月"
}

{
  "categories": [
    "Japanese entries with incorrect language header",
    "Japanese lemmas",
    "Japanese links with redundant alt parameters",
    "Japanese links with redundant wikilinks",
    "Japanese nouns",
    "Japanese terms read with on'yomi",
    "Japanese terms spelled with first grade kanji",
    "Japanese terms spelled with fourth grade kanji",
    "Japanese terms spelled with 昨 read as さく",
    "Japanese terms spelled with 月 read as げつ",
    "Japanese terms with 2 kanji",
    "Japanese terms with IPA pronunciation",
    "Japanese terms with IPA pronunciation missing pitch accent",
    "Japanese terms with non-redundant non-automated sortkeys",
    "Japanese terms with redundant sortkeys",
    "Pages with 2 entries",
    "Pages with entries",
    "ja:Time"
  ],
  "forms": [
    {
      "form": "昨月",
      "ruby": [
        [
          "昨",
          "さく"
        ],
        [
          "月",
          "げつ"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "sakugetsu",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "さくげつ"
      },
      "expansion": "昨(さく)月(げつ) • (sakugetsu)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Japanese terms with rare senses"
      ],
      "coordinate_terms": [
        {
          "word": "来月"
        }
      ],
      "glosses": [
        "last month"
      ],
      "links": [
        [
          "last",
          "last"
        ],
        [
          "month",
          "month"
        ]
      ],
      "raw_glosses": [
        "(rare) last month"
      ],
      "synonyms": [
        {
          "word": "前月"
        },
        {
          "word": "先月"
        },
        {
          "word": "去月"
        }
      ],
      "tags": [
        "rare"
      ]
    },
    {
      "glosses": [
        "the moon of last night"
      ],
      "links": [
        [
          "moon",
          "moon"
        ],
        [
          "last night",
          "last night"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[sa̠kɯ̟ɡe̞t͡sɨ]"
    }
  ],
  "word": "昨月"
}