There are multiple definitions - click on the translation that matches your context.
severability clause means:
Substantiv
partial
noun
Although this English phrase is the universally accepted and most-oft used translation for this boilerplate clause, a better translation may be the "savings clause", a phrase that emphasized that only the invalid clauses should be rendered unenforceable and the remaining provisions should be "saved".
a provision in an agreement or legislation that if one term is determined to be invalid (=unenforceable) the rest of the agreement or legislation is not affected by this fact and remains valid (=enforceable)
Without a severability clause, a court decision that one contract provision is unenforceable would invalidate the entire contract.