# Deci-

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{{Redirect|Deci|the American psychologist|Edward L. Deci}}
{{Short description|Metric system prefix meaning one tenth}}
{{Wiktionary|deci-}}
[[File:France, decim 1798-1799, the First Republic.jpg|thumb|250px|French 1 [decime](/source/decime) coin, equal to {{sfrac|1|10}} of a [franc](/source/French_franc). [First Republic](/source/French_First_Republic).]]
'''''Deci''''' (symbol '''d''') is a [decimal](/source/decimal_prefix) [unit prefix](/source/metric_prefix) in the [metric system](/source/metric_system) denoting a factor of one tenth. Proposed in 1793,<ref name="CTPM_1793">{{cite book|title=Instruction abrégée sur les mesures déduites de la grandeur de la Terre; uniformes pour toute la Rêpublique, et sur les Calculs relatifs à leur division décimale
|author=Commission temporaire de Poids & Mesures rêpublicaines, En exécution des Décrets de la Convention Nationale
|publisher=De l´imprimerie nationale exécutive du Louvre
|edition=Edition originale
|location=Paris, France
|language=fr
|date=1793
|url=https://archive.org/details/instructionabreg00hauy
|access-date=2015-10-09}}</ref> and adopted in 1795, the prefix comes from the Latin {{lang|la|decimus}}, meaning "tenth". Since 1960, the prefix is part of the [International System of Units](/source/International_System_of_Units) (SI).<ref>{{cite book
| title=The International System of Units (Si): The Metric System
| page=30
| publisher=DIANE Publishing
| year=1992
| url=https://books.google.com/books?id=y2-BDaoBVnwC&dq=si+derived+units+1960&pg=PA30
| isbn=9780941375740}}</ref><ref>{{cite web
| url=https://www.bipm.org/en/CGPM/db/11/12/
| title=Resolution 12 of the 11th CGPM
| date=1960
| publisher=[BIPM](/source/BIPM)
| access-date=2020-05-14
| archive-date=2020-04-08
| archive-url=https://web.archive.org/web/20200408155740/https://www.bipm.org/en/CGPM/db/11/12/
| url-status=dead
}}</ref>

A frequent use of the prefix is in the unit deciliter (dl), common in food recipes; many European homes have a deciliter measure for flour, water, etc. A common measure in engineering is the unit [decibel](/source/decibel) for measuring ratios of [power and root-power](/source/Power%2C_root-power%2C_and_field_quantities) quantities, such as sound level and electrical amplification.

Example
*The diameter of a [compact disc](/source/compact_disc) is about 12 centimetres or 1.2 decimetres.<ref>{{cite web
| title=Universcale: From the nanoworld to the universe — The worlds we measure using our infinite yardstick.
| publisher=[Nikon](/source/Nikon)
| date=2013
| url=https://www.nikon.com/about/sp/universcale/
| url-status=live
| archive-url=https://web.archive.org/web/20170208212202/http://www.nikon.com/about/sp/universcale/index.htm
| archive-date=2017-02-08
| access-date=2017-02-08}}</ref>

==References==
{{Reflist}}

{{SI prefixes (infobox)}}

Category:SI prefixes

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Adapted from the Wikipedia article [Deci-](https://en.wikipedia.org/wiki/Deci-) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Deci-?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.