As nouns the difference between magnetism and retentivity
is that magnetism
is the property of being magnetic while retentivity
is the ability to retain, potential for retention.
The property of being magnetic
The science which treats of magnetic phenomena.
Power of attraction; power to excite the feelings and to gain the affections.
The ability to retain, potential for retention
(sciences) The capacity to retain magnetism after the magnetizing action
* (general) retentiveness