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Definition of hysteresis : 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.

Usage examples:

• Not long ago Mr. Marconi invented, however, a telegraphic instrument based upon his discovery that the magnetic hysteresis of iron can be annulled by electric oscillations. - "Hertzian Wave Wireless Telegraphy", John Ambrose Fleming.
• 18, with their similar poles together, and, as the iron band passes through their field, a certain length of it is magnetised, and owing to the hysteresis of the material, it retains this magnetism for a short time after it has passed out of the centre of the field. - "Hertzian Wave Wireless Telegraphy", John Ambrose Fleming.
• Now what does hysteresis and laminations mean? - "Whispering Wires", Henry Leverage.