- so far, thus far, hitherto, still
- [2.1] again; [2.2] furthermore; [2.3] moreover; [2.4] besides (used in scholastic debates to introduce an additional point in one's argument)
- [3.1] even as, [3.2] while still
Please pardon my laziness; I have not linked the English adverbs above.
My conjecture: I can imagine two Roman arguers, one of whom points to an argument at some specific location (i.e. 'here') on some writing tool (e.g. wax tablet, piece of wood, papyrus), to which (i.e. to 'here') the other arguer adds more writing.