Acceptable damage or signs of use caused by the normal use of something, such as a carpet, machine or paintwork.

Commonly used in leases to limit the tenant’s responsibility (and therefore liability to repair and redecorate) upon leaving the premises. It is subjective but the considerations include the length of time of the tenancy (the longer the tenancy the more wear and tear can be expected), the lack of unusual damage such as a hole in the wall or a broken window, and the condition of the premises when the tenant moved in (usually evidenced by a schedule of condition).

The failure to do something which a reasonable person would do in a particular situation, or doing something which a reasonable and prudent person would not do in similar circumstances. If an injured person proves that another person acted negligently and caused their injury, they can recover damages to compensate for their injury.

The rule of law under which an act or omission of a claimant is a contributing cause of injury and possible bar to a complete recovery. It can be used as a defence to prevent a claimant from being awarded full damages if he or she did not take reasonable care of his or her self. In the United States, it is a defence that prevents a claimant from being awarded damages if he or she has knowingly and voluntarily accepted the risk of loss, injury or damage.