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unit of measurement

real scalar quantity, defined and adopted by convention, with which any other quantity of the same kind can be compared to express the ratio of the two quantities as a number (VIM)
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Summary

unit of measurement ranks in the top 2% of general entities by monthly Wikipedia readership (6,964 views/month).[1]

Key Facts

  • Subclass of: measure[2], scalar quantity[3], individual quantity[4], descriptive content entity[5], quantification facet[6], parameter[7]
  • Part of: system of units[8], quantity value[9]
  • Commons category: Units of measure[10]
  • Topic's main category: Category:Units of measurement[11]
  • Facet of: quantity[12]
  • Described by source: International Vocabulary of Metrology (3rd edition, 2012)[13], Brockhaus and Efron Encyclopedic Dictionary[14], Small Brockhaus and Efron Encyclopedic Dictionary[15], Russian translation of Lübker's Antiquity Lexicon[16], Jewish Encyclopedia of Brockhaus and Efron[17], Bible Encyclopedia of Archimandrite Nicephorus[18], ISO 80000-1:2009 Quantities and units—Part 1: General[19], Meyers Konversations-Lexikon, 4th edition (1885–1890)[20], Encyclopædia Britannica 11th edition[21], New International Encyclopedia[22]
  • Topic has template: Template:Infobox unit[23], Q22804808[24]
  • Stack Exchange tag: https://physics.stackexchange.com/tags/units[25], https://english.stackexchange.com/tags/measuring-units[26], https://math.stackexchange.com/tags/unit-of-measure[27], https://tex.stackexchange.com/tags/units[28], https://chemistry.stackexchange.com/tags/units[29], https://biology.stackexchange.com/tags/units[30], https://dsp.stackexchange.com/tags/physical-units[31], https://blender.stackexchange.com/tags/units[32], https://electronics.stackexchange.com/tags/units[33]
  • Main Wikidata property: P111[34], P8111[35]
  • Equivalent class: http://id.loc.gov/ontologies/bibframe/Unit[36], http://erlangen-crm.org/current/E58_Measurement_Unit[37], http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#UnitOfMeasure[38], http://qudt.org/schema/qudt#Unit[39], https://w3id.org/semanticarts/ns/ontology/gist/UnitOfMeasure[40], http://www.kyoto-project.eu/ontologies/Kyoto3Middle#physical_units_of_measure[41]
  • NCI Thesaurus ID: C25709[42]
  • Different from: allowed units constraint[43], quantity dimension[44], measurement scale[45], unit[46], unit of measure[47]
  • Properties for this type: P3328[48], P2968[49], P2370[50], P2442[51], P5061[52], P111[53], P6512[54], P7007[55], P7825[56]
  • Studied by: metrology[57]
  • Disjoint union of: list of values as qualifiers[58]

Why It Matters

unit of measurement has Wikipedia articles in 30 language editions, a strong signal of global cultural recognition.[59] It is known by 107 alternative names across languages and contexts.[60]

Related Entities

currency Fabio Cannavaro Hebei Normal University metrology

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.
  5. [6] ↑ . wikidata.org.
  6. [7] ↑ . wikidata.org.
  7. [8] ↑ . wikidata.org.
  8. [9] ↑ . wikidata.org.
  9. [10] ↑ . wikidata.org.
  10. [11] ↑ . wikidata.org.
  11. [12] ↑ . wikidata.org.
  12. [13] ↑ . wikidata.org.
  13. [14] ↑ . wikidata.org.
  14. [15] ↑ . wikidata.org.
  15. [16] ↑ . wikidata.org.
  16. [17] ↑ . wikidata.org.
  17. [18] ↑ . wikidata.org.
  18. [19] ↑ . wikidata.org.
  19. [20] ↑ . wikidata.org.
  20. [21] ↑ . wikidata.org.
  21. [22] ↑ . wikidata.org.
  22. [23] ↑ . wikidata.org.
  23. [24] ↑ . wikidata.org.
  24. [25] ↑ . wikidata.org.
  25. [26] ↑ . wikidata.org.
  26. [27] ↑ . wikidata.org.
  27. [28] ↑ . wikidata.org.
  28. [29] ↑ . wikidata.org.
  29. [30] ↑ . wikidata.org.
  30. [31] ↑ . wikidata.org.
  31. [32] ↑ . wikidata.org.
  32. [33] ↑ . wikidata.org.
  33. [34] ↑ . wikidata.org.
  34. [35] ↑ . wikidata.org.
  35. [36] ↑ . wikidata.org.
  36. [37] ↑ . wikidata.org.
  37. [38] ↑ . DOLCE+DnS Ultralite. wikidata.org.
  38. [39] ↑ . QUDT - Quantities, Units, Dimensions and Data Types Ontologies. wikidata.org.
  39. [40] ↑ . Q141190966. wikidata.org.
  40. [41] ↑ . Q141581969. wikidata.org.
  41. [42] ↑ . wikidata.org.
  42. [43] ↑ . wikidata.org.
  43. [44] ↑ . wikidata.org.
  44. [45] ↑ . wikidata.org.
  45. [46] ↑ . wikidata.org.
  46. [47] ↑ . wikidata.org.
  47. [48] ↑ . wikidata.org.
  48. [49] ↑ . wikidata.org.
  49. [50] ↑ . wikidata.org.
  50. [51] ↑ . wikidata.org.
  51. [52] ↑ . wikidata.org.
  52. [53] ↑ . wikidata.org.
  53. [54] ↑ . wikidata.org.
  54. [55] ↑ . wikidata.org.
  55. [56] ↑ . wikidata.org.
  56. [57] ↑ . wikidata.org.
  57. [58] ↑ . wikidata.org.

Aggregate / graph-position facts

  1. [1] ↑ . Wikimedia Foundation. dumps.wikimedia.org.
  2. [59] ↑ . Wikidata sitelinks. wikidata.org.
  3. [60] ↑ . 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). unit of measurement. Retrieved October 13, 2026, from https://4ort.xyz/entity/unit-of-measurement
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BibTeX @misc{4ortxyz_unit-of-measurement_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{unit of measurement}}, year = {2026}, url = {https://4ort.xyz/entity/unit-of-measurement}, note = {Accessed: 2026-10-13}}
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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. 2d ago · عُثمان · 2026-10-13 view diff on Wikidata ↗
    Equivalent class → http://id.loc.gov/ontologies/bibframe/Unit, http://erlangen-crm.org/current/E58_Measurement_Unit, http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#UnitOf +3
    Claims rich → —
    "/* wbsetclaim-create:2||1 */ Equivalent class: http://www.kyoto-project.eu/ontologies/Kyoto3Middle#physical_units_of_measure"
  2. 8d ago · عُثمان · 2026-10-07 view diff on Wikidata ↗
    P14870 → ont00000120
    Equivalent class → http://id.loc.gov/ontologies/bibframe/Unit, http://erlangen-crm.org/current/E58_Measurement_Unit, http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#UnitOf +3
    Subclass of → measure, scalar quantity, individual quantity +3
    Claims rich → —
    "/* wbsetclaim-create:2||1 */ Equivalent class: https://w3id.org/semanticarts/ns/ontology/gist/UnitOfMeasure"
  3. 12d ago · عُثمان · 2026-10-03 view diff on Wikidata ↗
    Sitelink count → 107
    Wikipedia languages → ['an', 'ar', 'ary', 'ast', 'av', 'az', 'be', 'be_x_old', 'bg', 'bn', 'bs', 'ca',
    Exact match → —
    Equivalent class → http://id.loc.gov/ontologies/bibframe/Unit, http://erlangen-crm.org/current/E58_Measurement_Unit, http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#UnitOf +3
    + 1 other property edited (see Wikidata diff for full list)
    "/* wbeditentity-statements-multiple-properties-update:0||2 */ Moving Exact match to Equivalent class"
  4. 27d ago · Zache · 2026-09-18 view diff on Wikidata ↗
    P14864 → mittayksikko
    "/* wbsetclaim-create:1||1 */ P14864: mittayksikko, Matched to [[:toollabs:mix-n-match/#/entry/323351121|Mittayksikkö (#323351121)]] in [[:toollabs:mix-n-match/#/catalog/8450|Statistics Fi"
  5. 5w ago · عُثمان · 2026-09-10 view diff on Wikidata ↗
    P14870 → ont00000120
    "/* wbsetclaim-create:2||1 */ P14870: ont00000074"
  6. 6w ago · عُثمان · 2026-08-31 view diff on Wikidata ↗
    Different from → allowed units constraint, quantity dimension, measurement scale +2
    "/* wbsetclaim-create:2||1 */ Different from: unit of measure"
  7. 13w ago · Nyuhn · 2026-07-10 view diff on Wikidata ↗
    P14541 → 4E19bu
    "/* wbeditentity-update:0| */ QuickStatements 3.0 [[:toollabs:qs-dev/batch/40849|batch #40849]]: ZGBK ID"
  8. 18w ago · Jindřich Rubeš · 2026-06-11 view diff on Wikidata ↗
    Svkkl authority id → h0005964-fyzikalni-jednotky
    "/* wbcreateclaim-create:1| */ Svkkl authority id: h0005964-fyzikalni-jednotky, [[:toollabs:quickstatements/#/batch/259496|batch #259496]]"
  9. 21w ago · Twofivesixbot bot · 2026-05-19 view diff on Wikidata ↗
    Arabic ontology lexical concept id → 151072606
    Interlingual index id → i108085
    "/* wbsetclaim-update-qualifiers:1||1|6 */ Yso id: 4366, mv to monolingual text names on YSO statements"
  10. 21w ago · Mahir256 · 2026-05-17 view diff on Wikidata ↗
    Wordnet 3.1 synset id → 13604927-n
    "/* wbsetclaim-create:2||1 */ Wordnet 3.1 synset id: 13604927-n"
  11. 22w ago · Mullanur · 2026-05-14 view diff on Wikidata ↗
    Topic's main category → Category:Units of measurement
    Aliases → —
    Subclass of → —
    Different from → allowed units constraint, quantity dimension, measurement scale +2
    + 13 other properties edited (see Wikidata diff for full list)
    "/* wbsetclaim-create:2||1 */ Fandom article id: ru.science:Единица_измерения"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.