Deca-

Deca- (and dec-), sometimes deka-, is a common English-language numeral prefix derived from the Late Latin decas ("(set of) ten"), from Ancient Greek δέκας (dékas), from δέκα (déka, "ten").^[1] It is used in many words.

It is also a decimal unit prefix in the International System of Units (SI) denoting a factor of ten, with symbol da and spelled "deca" internationally^[a] (or "deka" in American spelling^[3]).

^ Chambers Twentieth Century Dictionary. 1979. p. 332.
^ Decimal multiples and submultiples of SI units Archived 2019-03-30 at the Wayback Machine, 2006, SI Brochure: The International System of Units (SI), 8th edition
^ Guide for the Use of the International System of Units (SI), 1995, NIST Special Publication 811

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[1] Chambers Twentieth Century Dictionary. 1979. p. 332.

[bipm-spelling-2] Decimal multiples and submultiples of SI units Archived 2019-03-30 at the Wayback Machine, 2006, SI Brochure: The International System of Units (SI), 8th edition

[SP811-4] Guide for the Use of the International System of Units (SI), 1995, NIST Special Publication 811

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