# Wikidata:Property proposal/official definition

### official definition

Under discussion
Description the official definition for an item such as the General Conference of Weights and Measures definition for the International System of Units second, meter and kilogram second (Q11574) String official definition by authoritative body and international agreement. item, property second (Q11574)-> "The second, symbol s, is the SI unit of time. It is defined by taking the fixed numerical value of the caesium frequency $\mathrm {\Delta \nu _{Cs}}$ , the unperturbed ground-state hyperfine transition frequency of the caesium $133$ atom, to be $9\ 192\ 631\ 770$ when expressed in the unit $\mathrm {Hz}$ , which is equal to $s^{-1}$ ." metre (Q11573)->"The metre, symbol m, is the SI unit of length. It is defined by taking the fixed numerical value of the speed of light in vacuum, $\mathrm {c}$ , to be $299\ 792\ 458$ when expressed in the unit $\mathrm {m\ s^{-1}}$ , where the second is defined in terms of the caesium frequency $\mathrm {\Delta \nu _{Cs}}$ ." kilogram (Q11570)->"The kilogram, symbol $\mathrm {kg}$ , is the SI unit of mass. It is defined by taking the fixed numerical value of the Planck constant, $\mathrm {h}$ , to be $6.626\ 070\ 15\times {10}^{-34}$ when expressed in the unit $\mathrm {J\ s}$ , which is equal to $\mathrm {kg\ {m}^{2}\ s^{-1}}$ , where the metre and the second are defined interms of c and ∆νCs." ampere (Q25272)->"The ampere, symbol A, is the SI unit of electric current. It is defined by taking the fixed numerical value of the elementary charge, e, to be $1.602\ 176\ 634\times {10}^{-19}$ when expressed in the unit C, which is equal to A s, where the second is defined in terms of $\mathrm {\Delta \nu _{Cs}}$ .
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." |planned use = I plan to use this for the second, meter, kilogram, ampere, kelvin, mole, and candela |number of ids = |expected completeness = |formatter URL = |external links = |see also = |robot and gadget jobs = |subpage = official definition |topic = generic |applicable stated in value = |single value constraint = |distinct values constraint = |Wikidata project = }}

#### Motivation

I want to add the official definition for the SI units.WalkingRadiance (talk) 19:58, 3 July 2022 (UTC)

#### Discussion

Disagree Note that an "official definition" is sometimes in actuality about 12 pages long and not merely a sentence or two, because the definition is sometimes an amalgamation of all the constraints, secondary representations, etc. For example, hertz (Q39369), the caesium hyperfine frequency ΔνCs , can also be defined as https://www.bipm.org/documents/20126/69375160/199Hg_1129THz_2021.pdf/55fd06b5-0530-1a1c-42e6-129c121b2443 --Thadguidry (talk) 17:51, 4 July 2022 (UTC)