A word used to refer to situations where audi alteram partem (the right to be heard) and nemo judex in parte sua (no person may judge their own case) apply.
The principles of natural justice were derived from the Romans who believed that some legal principles were "natural" or self-evident and did not require a statutory basis.
These two basic legal safeguards govern all decisions by judges or government officials when they take quasi-judicial or judicial decisions.