Grandfather clause

Rarity: Common

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At a glance

Class

Notion

Domain

Science and technology

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What Wikipedia says

A grandfather clause, also known as grandfather policy, grandfathering, or being grandfathered in, is a provision in which an old rule continues to apply to some existing situations while a new rule will apply to all future cases.

Excerpt from the Wikipedia article “Grandfather clause”, under the CC BY-SA 4.0 license. Read the article on Wikipedia