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unbirthday

event that is typically celebrated on any of the days in which it is not the person's birthday
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unbirthday

Summary

unbirthday ranks in the top 2% of general entities by monthly Wikipedia readership (1,403 views/month).[1]

Key Facts

  • unbirthday is a type of day[2].
  • unbirthday is the opposite of birthday[3].
  • unbirthday's different from is recorded as half-birthday[4].
  • unbirthday's named by is recorded as Lewis Carroll[5].

Body

Definition and Type

unbirthday is a type of day[2]. unbirthday is the opposite of birthday[3].

Why It Matters

unbirthday ranks in the top 2% of general entities by monthly Wikipedia readership (1,403 views/month).[1] unbirthday has Wikipedia articles in 11 language editions, a strong signal of global cultural recognition.[6] unbirthday is known by 22 alternative names across languages and contexts.[7]

Related Entities

Lewis Carroll

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [2] ↑ . wikidata.org.
  2. [3] ↑ . wikidata.org.
  3. [4] ↑ . wikidata.org.
  4. [5] ↑ . wikidata.org.

Aggregate / graph-position facts

  1. [1] ↑ . Wikimedia Foundation. dumps.wikimedia.org.
  2. [6] ↑ . Wikidata sitelinks. wikidata.org.
  3. [7] ↑ . Wikidata aliases. wikidata.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). unbirthday. Retrieved April 10, 2026, from https://4ort.xyz/entity/unbirthday
MLA “unbirthday.” 4ort.xyz Knowledge Graph, 4ort.xyz, 10 Apr. 2026, https://4ort.xyz/entity/unbirthday.
BibTeX @misc{4ortxyz_unbirthday_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{unbirthday}}, year = {2026}, url = {https://4ort.xyz/entity/unbirthday}, note = {Accessed: 2026-04-10}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): unbirthday — https://4ort.xyz/entity/unbirthday (retrieved 2026-04-10)

Canonical URL: https://4ort.xyz/entity/unbirthday · Last refreshed:

Edit History

Rolling log of changes to this entity's Wikidata record. Values shown reflect the current state of each edited property — follow the history link to see the precise diff for any edit.

  1. 8h ago · Yukkuri Shambis · 2026-09-22 view diff on Wikidata ↗
    Subclass of → day
    Aliases → —
    Opposite of → birthday
    Subclass of → —
    + 3 other properties edited (see Wikidata diff for full list)
    "/* wbsetclaim-create:2||1 */ [[Property:P6900]]: unbirthday"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.