The spelling in the United States of the SI decimal multiplier prefix meaning 10. In the rest of the world it is often spelled “deca-.”
The 1991 edition of NIST Special Publication 330 (The International System of Units (SI) ) observes in a footnote (page 10): “USA Editor's note: Outside the USA, the spelling 'deca' is extensively used.” This footnote does not appear in the 2001 edition.
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Last revised: 27 May 2004.