second

SI unit of time, defined as 9 192 631 770 periods of the ground-state hyperfine transitions of caesium-133
Intangible si_base_unit Q11574
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second

Summary

second is a SI base unit[1]. second draws 16,251 Wikipedia views per month (si_base_unit category, ranking #4 of 7).[2]

Key Facts

  • second's instance of is recorded as SI base unit[3].
  • second's instance of is recorded as unit of time[4].
  • second's instance of is recorded as UCUM base unit[5].
  • second's instance of is recorded as SI unit with special name[6].
  • second's measured physical quantity is recorded as duration[7].
  • second's measured physical quantity is recorded as specific impulse by weight[8].
  • second's measured physical quantity is recorded as half-life[9].
  • second's measured physical quantity is recorded as reactor time constant[10].
  • second is a type of time interval[11].
  • second is part of minute[12].
  • second is part of centimeter–gram–second system of units[13].
  • second is part of MKS system of units[14].
  • second's Commons category is recorded as Second[15].
  • second's topic's main category is recorded as Category:Second[16].
  • second's Commons gallery is recorded as Second[17].
  • second's numeric value is recorded as {'amount': '+9192631770'}[18].
  • second's described by source is recorded as ISO 80000-3:2006 Quantities and units — Part 3: Space and time[19].
  • second's NCI Thesaurus ID is recorded as C42535[20].
  • second's short name is recorded as sek.[21].
  • second's short name is recorded as sek.[22].
  • second's short name is recorded as sek.[23].
  • second's short name is recorded as s[24].
  • second's short name is recorded as sec[25].
  • second's different from is recorded as Sekunde[26].
  • second's different from is recorded as step[27].

Body

Definition and Type

Recorded instance of include SI base unit[3], unit of time[4], UCUM base unit[5], and SI unit with special name[6]. second is a type of time interval[11].

Use and Application

Part of include minute[12], an unit of time[28]; centimeter–gram–second system of units[13], a coherent system of units[29]; and MKS system of units[14], a system of units[30].

Influence

Things named for second include zeptosecond[31], an unit of time[32] and 60 Seconds! Reatomized[33], a video game[34].

Why It Matters

second draws 16,251 Wikipedia views per month (si_base_unit category, ranking #4 of 7).[2] second has Wikipedia articles in 30 language editions, a strong signal of global cultural recognition.[35] second is known by 77 alternative names across languages and contexts.[36]

Entities named for second include zeptosecond[31], an unit of time[32] and 60 Seconds! Reatomized[33], a video game[34].

References

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

Direct Wikidata claims

  1. [3] ↑ . wikidata.org.
  2. [4] ↑ . wikidata.org.
  3. [5] ↑ . wikidata.org.
  4. [6] ↑ . wikidata.org.
  5. [7] ↑ . wikidata.org.
  6. [8] ↑ . wikidata.org.
  7. [9] ↑ . wikidata.org.
  8. [10] ↑ . wikidata.org.
  9. [11] ↑ . wikidata.org.
  10. [12] ↑ . wikidata.org.
  11. [13] ↑ . wikidata.org.
  12. [14] ↑ . wikidata.org.
  13. [15] ↑ . wikidata.org.
  14. [16] ↑ . wikidata.org.
  15. [17] ↑ . wikidata.org.
  16. [18] ↑ . wikidata.org.
  17. [19] ↑ . wikidata.org.
  18. [20] ↑ . wikidata.org.
  19. [21] ↑ . wikidata.org.
  20. [22] ↑ . wikidata.org.
  21. [23] ↑ . wikidata.org.
  22. [24] ↑ . wikidata.org.
  23. [25] ↑ . wikidata.org.
  24. [26] ↑ . wikidata.org.
  25. [27] ↑ . wikidata.org.

Inverse relationships (entities pointing at this one)

  1. [31] ↑ . wikidata.org. → on this site
  2. [33] ↑ . wikidata.org. → on this site

Inline context (facts about related entities)

  1. [28] ↑ . Wikidata. wikidata.org. → on this site
  2. [29] ↑ . Wikidata. wikidata.org. → on this site
  3. [30] ↑ . Wikidata. wikidata.org. → on this site
  4. [32] ↑ . Wikidata. wikidata.org. → on this site
  5. [34] ↑ . Wikidata. wikidata.org. → on this site

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] ↑ . Wikimedia Foundation. dumps.wikimedia.org.
  2. [35] ↑ . Wikidata sitelinks. wikidata.org.
  3. [36] ↑ . 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). second. Retrieved October 3, 2026, from https://4ort.xyz/entity/second
MLA “second.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 Oct. 2026, https://4ort.xyz/entity/second.
BibTeX @misc{4ortxyz_second_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{second}}, year = {2026}, url = {https://4ort.xyz/entity/second}, note = {Accessed: 2026-10-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): second — https://4ort.xyz/entity/second (retrieved 2026-10-03)

Canonical URL: https://4ort.xyz/entity/second · 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. 24d ago · Mahir256 · 2026-09-09 view diff on Wikidata ↗
    P14870 → ont00000992
    "/* wbremoveclaims-remove:1| */ [[Property:P1709]]: https://www.commoncoreontologies.org/ont00000992, #quickstatements; #temporary_batch_1788979007401"
  2. 12w ago · Nyuhn · 2026-07-10 view diff on Wikidata ↗
    Short name → sek., sek., sek. +2
    P14541 → 1AO0vx
    "/* wbeditentity-update:0| */ QuickStatements 3.0 [[:toollabs:qs-dev/batch/40849|batch #40849]]: ZGBK ID"
  3. 12w ago · ForeverFlying · 2026-07-08 view diff on Wikidata ↗
    Short name → sek., sek., sek. +2
    "/* wbsetclaim-create:2||1 */ [[Property:P1813]]: s"
  4. 18w ago · Tholzheim · 2026-05-27 view diff on Wikidata ↗
    Nci thesaurus id → C42535
    Factgrid item id → Tumbes
    Arabic ontology lexical concept id → 151081830
    Interlingual index id → i117299
    "/* wbeditentity-update:0| */ adds FactGrid ID"
  5. 18w ago · Mahir256 · 2026-05-26 view diff on Wikidata ↗
    Umls cui → C0457385
    "/* wbsetclaim-create:2||1 */ [[Property:P2892]]: C0457385"
  6. 18w ago · Qwfjgp · 2026-05-26 view diff on Wikidata ↗
    Numeric value → {'amount': '+9192631770'}, {'amount': '+0.000000031688764640818492441649983866417932843
    Wikidata time precision → {'amount': '+14'}
    Subdivision of this unit → decisecond, tierce, millisecond +1
    Part of → —
    + 16 other properties edited (see Wikidata diff for full list)
    "/* wbsetclaim-update:2||1 */ [[Property:P5061]]: san"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.