Unit of length - Wikipedia Unit of length A ruler, depicting two customary units of length, the centimeter and the inch A unit of length refers to any arbitrarily chosen and accepted reference standard for measurement of length The most common units in modern use are the metric units, used in every country globally In the United States the U S customary units are also
Length - definition of length by The Free Dictionary 2 the extent of something from beginning to end, measured in some more or less regular units or intervals: the book was 600 pages in length 3 a specified distance, esp between two positions or locations: the length of a race