For the marketing association, see DECA (Organization)

Deca- (U.S. spelling deka, Greek δέκα) is a Greek prefix meaning ten. The Latin equivalent is deci-.

The prefix is an SI prefix (symbol da) in the SI system of units denoting a factor of 10¹ or 10. It is not in very common usage. The SI prefix was adopted by France in 1795 and internationally by 1960.

• 1 decametre = 10 metres
• 1 decalitre = 10 litres

Examples:

• In calendars a decade is a period of ten years.

• In electromechanical equipment a decade is a group of ten numbers on a switch or indicator, which may represent units, tens, hundreds, etc.

• A Decapod is a ten-legged creature. One kind of decapod is the lobster (a kind of arthropod of the order decapoda), another is the cuttlefish (a kind of cephalopod).

• A decagon is a polygon with 10 sides.

SI prefixes

10n	Prefix	Symbol	Short scale	Long scale Name	Decimal Equivalent
1024	yotta	Y	Septillion	Quadrillion	1 000 000 000 000 000 000 000 000
1021	zetta	Z	Sextillion	Trilliard (thousand trillion)	1 000 000 000 000 000 000 000
1018	exa	E	Quintillion	Trillion	1 000 000 000 000 000 000
1015	peta	P	Quadrillion	Billiard (thousand billion)	1 000 000 000 000 000
1012	tera	T	Trillion	Billion	1 000 000 000 000
109	giga	G	Billion	Milliard (thousand million)	1 000 000 000
106	mega	M	Million		1 000 000
103	kilo	k	Thousand		1 000
102	hecto	h	Hundred		100
101	deca, deka	da	Ten		10
10−1	deci	d	Tenth		0.1
10−2	centi	c	Hundredth		0.01
10−3	milli	m	Thousandth		0.001
10−6	micro	µ	Millionth		0.000 001
10−9	nano	n	Billionth	Milliardth	0.000 000 001
10−12	pico	p	Trillionth	Billionth	0.000 000 000 001
10−15	femto	f	Quadrillionth	Billiardth	0.000 000 000 000 001
10−18	atto	a	Quintillionth	Trillionth	0.000 000 000 000 000 001
10−21	zepto	z	Sextillionth	Trilliardth	0.000 000 000 000 000 000 001
10−24	yocto	y	Septillionth	Quadrillionth	0.000 000 000 000 000 000 000 001
edit  (http://www.wordiq.com/definition/Template:SI_prefixes)

See Also

• SI prefix
• Greek numerical prefixes

External link

• BIPM website (http://www.bipm.org)

ca:Deca es:Deca fr:Déca sl:Deka