Definitions for hysteresisˌhɪs təˈri sɪs
Random House Webster's College Dictionary
hys•ter•e•sisˌhɪs təˈri sɪs(n.)
a lag in response exhibited by a body in reacting to changes in forces, esp. magnetic forces, acting upon it.
Origin of hysteresis:
1795–1805; < Gk hystérēsis deficiency, state of being behind or late =hysterē-, var. s. of hystereîn to come late, lag behind, v. der. of hýsteros coming behind +-sis -sis
the lagging of an effect behind its cause; especially the phenomenon in which the magnetic induction of a ferromagnetic material lags behind the changing magnetic field
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 75u00B0 might switch the controlled heat source on when the temperature drops below 74u00B0, and off when it rises above 76u00B0.
a lagging or retardation of the effect, when the forces acting upon a body are changed, as if from velocity or internal friction; a temporary resistance to change from a condition previously induced, observed in magnetism, thermoelectricity, etc., on reversal of polarity