Taking away; reduction; lessening; incompleteness.
The term diminution is used in law to signify that a record submitted by an inferior court to a superior court for review is not complete or not fully certified.
Diminution in market value is a rule of damages, within which the proper measure of damages for permanent injury to real property is the reduction of market value for any use to which the property might be appropriated. It is a rule providing for the before-and-after value of stolen or damaged property.