Final answer:
An impartial witness in law is someone who remains neutral and unbiased while providing testimony or evidence in a legal proceeding.
Step-by-step explanation:
An impartial witness in the context of law refers to someone who remains neutral and unbiased while providing testimony or evidence in a legal proceeding. This person does not have any personal interest or stake in the case and is expected to provide an objective account of events.
For example, in a criminal trial, an impartial witness may be a bystander or a third party who observed the incident and can provide an unbiased account of what took place.