“Quantum Satis” in flavour regulation: what is it?

Anyone with a slight interest in the composition of flavourings and the associated regulations often comes across this term: Quantum Satis.

What is its definition? Why is it used? What are the concrete impacts for flavourists in terms of flavour formulation? For the regulatory departments of flavour houses? And for users of flavourings?

A full review with Flavour Manager on this page.