The interval within which the true value can be expected to lie, with a given level of confidence or probability, eg “the speed is 20 m/s ± 1 m/s , at a level of confidence of 90 %.

It is the upward force acting on an object that is partially or fully immersed in a fluid.

Companies (usually power distributors) permitted to provide important public services (such as energy or water) to a region.