precedent

noun
C1+
1
C1+
an official action or decision that has happened in the past and that is seen as an example or a rule to be followed in a similar situation later
سابقه, نمونه قبلی, سابقه قانونی, روال پیشین
2
C1+
a similar action or event that happened earlier
سابقه, نمونه گذشته, نمونه قبلی, مورد مشابه, نمونه پیشین, مورد قبلی
historical precedents
There is no precedent for a disaster of this scale.
Such protests are without precedent in recent history.
The achievements of this period were without precedent in history.
3
the way that things have always been done
رویه, روال, رسم
to break with precedent
see also unprecedented