"big year" meaning in English

{
  "forms": [
    {
      "form": "big years",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "big year (plural big years)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "94 6",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "92 8",
          "kind": "other",
          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "91 9",
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "95 5",
          "kind": "topical",
          "langcode": "en",
          "name": "Birdwatching",
          "orig": "en:Birdwatching",
          "parents": [
            "Hobbies",
            "Recreation",
            "Human activity",
            "Human behaviour",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "ref": "2005, Sean Dooley, The Big Twitch, Sydney: Allen and Unwin, page 21",
          "text": "And so the record stood. Nobody seemed to be much concerned with it, unlike in Britain or the States where Big Years are hotly contested amongst twitchers.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "An informal competition among birdwatchers to determine who can see or hear the largest number of species of birds within a single calendar year and within a specific geographical area."
      ],
      "id": "en-big_year-en-noun-QSpe6Enk",
      "links": [
        [
          "informal",
          "informal"
        ],
        [
          "competition",
          "competition"
        ],
        [
          "birdwatcher",
          "birdwatcher"
        ]
      ]
    },
    {
      "glosses": [
        "Used other than figuratively or idiomatically: see big, year."
      ],
      "id": "en-big_year-en-noun-E3pGQJTk",
      "links": [
        [
          "big",
          "big#English"
        ],
        [
          "year",
          "year#English"
        ]
      ]
    }
  ],
  "word": "big year"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English entries with topic categories using raw markup",
    "English lemmas",
    "English multiword terms",
    "English nouns",
    "English terms with non-redundant non-automated sortkeys",
    "en:Birdwatching"
  ],
  "forms": [
    {
      "form": "big years",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "big year (plural big years)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2005, Sean Dooley, The Big Twitch, Sydney: Allen and Unwin, page 21",
          "text": "And so the record stood. Nobody seemed to be much concerned with it, unlike in Britain or the States where Big Years are hotly contested amongst twitchers.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "An informal competition among birdwatchers to determine who can see or hear the largest number of species of birds within a single calendar year and within a specific geographical area."
      ],
      "links": [
        [
          "informal",
          "informal"
        ],
        [
          "competition",
          "competition"
        ],
        [
          "birdwatcher",
          "birdwatcher"
        ]
      ]
    },
    {
      "glosses": [
        "Used other than figuratively or idiomatically: see big, year."
      ],
      "links": [
        [
          "big",
          "big#English"
        ],
        [
          "year",
          "year#English"
        ]
      ]
    }
  ],
  "word": "big year"
}