hysteresis

== English == === Etymology === Coined by Sir James Alfred Ewing from Ancient Greek ὑστέρησις (hustérēsis, “shortcoming”), from ὑστερέω (husteréō, “I am late, fall short”), from ὕστερος (hústeros, “later”). By surface analysis, hyster- (“higher, outer, latter, next”) +‎ -esis. === Noun === hysteresis (countable and uncountable, plural hystereses) A property of a system such that an output value is not a strict function of the corresponding input, but also incorporates some lag, delay, or history dependence, and in particular when the response for a decrease in the input variable is different from the response for an increase. For example, a thermostat with a nominal setpoint of 75° might switch the controlled heat source on when the temperature drops below 74°, and off when it rises above 76°. Magnetic friction in dynamos, by which every reversal of magnetism in the iron causes dissipation of energy. ==== Derived terms ==== ==== Translations ==== === References ===