Deci is the si prefix for one tenth, eg. a decilitre is 0.1litre. It's not really used much, most si units stick to thousands; milli, micro, kilo, mega.
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it means 1-tenth
Deci means ten. Our numeral system is based on the counting of tens.
It is the prefix meaning '10'.
2 dm is two decimetres The metric deci- prefix means 1/10 (tenth or 0.1) ⇒ 2 dm = 2 x 1/10 m = 0.2 m
It refers to ten. The decimal system is based on counting in tens.