There are multiple definitions - click on the translation that matches your context.

Anfechtung

Substantiv

partial

rescission

noun

Comparative law notes

Switzerland

This translation is a very close match to the German concept in a contractual context.

Definitions of rescission

English

the right to treat a contract as if it never existed or rescind contract rights; generally appropriate in cases of fraud and misrepresentation

The UK airport operator has begun legal proceedings in the High Court to seek rescission of its contract with Eurotunnel.