Deci-

{{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 coin, equal to {{sfrac|1|10}} of a franc. First Republic.]] '''''Deci''''' (symbol '''d''') is a decimal unit prefix in the 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 (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 | 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 for measuring ratios of power and root-power quantities, such as sound level and electrical amplification.

Example *The diameter of a 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 | 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}}

Category:SI prefixes