What is the appropriate logical expression for "hold where"?

Question

If we write a statement like "A holds where B", then does it mean $A \iff B$ or only $B \Rightarrow A$?

Answer 1

A bit of an unusual expression ... did you run into a concrete use of it? English is ambiguous, so oftentimes context and background knowledge can tell you what is meant. Still, if I had to choose between them, I would pick the one-way conditional: .. if I wanted the biconditional, I would have used something like 'A holds exactly where B holds' ... or 'A holds where, and only where, B holds'. But a simple 'A holds where B holds' suggests to me $B \to A$