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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">Template:Cite book</ref> and adopted in 1795, the prefix comes from the Latin {{#invoke:Lang|lang}}, meaning "tenth". Since 1960, the prefix is part of the International System of Units (SI).<ref>Template:Cite book</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</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>{{#invoke:citation/CS1|citation
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