I'm looking at the Massive Dev Chart website. It shows a table like this:
What's the meaning of
stock dilution there? How should we prepare the developer on that condition?
Jargon of photographic chemical mixing and preparation:
As a rule of thumb — concentrates and stock solutions have prolonged shelf life. A working solution has greatly reduced shelf life.
'Stock' means 1+0: don't dilute the dev at all, just use the stock solution you made up.