tusendels

Tusendels is a term encountered in several European language contexts to denote a fraction equal to one thousandth of a base quantity. In mathematical and measurement discussions, a tusendel corresponds to the value 0.001 of the chosen unit, placing it in the same order of magnitude as the decimal third place after the point. For example, one tusendel of a meter is 0.001 meters, which is equivalent to one millimeter.

In practical use, tusendels are discussed when precision requires reporting measurements to the thousandth of a unit. The concept aligns with the SI prefix milli-, which denotes a factor of 10^-3; thus a tusendel of any base unit can be viewed as a milli-unit of that quantity. The exact terminology and spelling of tusendels vary by language, and in many English-language texts the standard term is thousandths rather than tusendels.

Etymology and regional usage vary: the form and spelling reflect older or regional linguistic traditions that derive from words for “thousand.” Because tusendels are not a universal standard term in English, their appearance is most common in translated or historical material, technical glossaries, or discussions of cross-language measurement terminology.

See also: thousandth, milli-, decimal notation, measurement precision.