 Look up decimeter in Wiktionary, the free dictionary. 
The decimetre (International spelling as used by the International Bureau of Weights and Measures; SI symbol dm) or decimeter (American spelling) is a unit of length in the metric system, equal to one tenth of a metre, the SI base unit of length (or ten centimetres). Equivalently, there are 10 decimetres in a metre. It is equivalent to 3.93700787 inches. It can be written in scientific notation as 100×10^{−3} m (engineering notation) or 1 E1 m (exponential notation) — meaning 100 × 1 mm or 0.1 m respectively. The c is pronounced as /s/, unlike in decametre. The common nonSI metric unit of volume, the litre, is defined as one cubic decimetre (however, between 1901 and 1964, there was a slight difference between the two due to the litre being defined with respect to the kilogram rather than the metre).
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 From smallest to largest (left to right). Commonly used units shown in bold italics.   
