Where does “billion” come from?

I need to analyze this chain carefully, but I notice the chain appears to contain repetitions of "English black," "English billion," and "English bi-" without clear etymological progression or source languages beyond English. The chain doesn't provide: - Source languages (only English appears) - Original language forms with consistent spellings - Meaning information for any stage - A coherent etymological path Without a proper etymological chain showing progression from older to newer languages with original spellings and attested meanings, I cannot write an accurate one-sentence etymology following your rules. Could you verify the chain data? A proper etymology for "billion" would typically trace through French and Latin sources, not loop through English variants.

billion (English): cardinal...