This is the 862nd most frequent French word.
responsabilité
The state or fact of being accountable or having a duty to deal with something.
The word 'responsabilité' is used here to denote the moral or legal obligation someone has for their actions or those that affect others.
Il assume la responsabilité de ses actes.
He takes responsibility for his actions.
Here, 'responsabilité' implies a duty or task that someone is assigned or expected to fulfill.
C'est votre responsabilité de veiller à ce que tout soit prêt.
It is your responsibility to ensure that everything is ready.
In this sentence, 'responsabilité' refers to an assigned duty or obligation for overseeing a specific matter.