- A billion times so;
- a billionfold dilution
- a billionfold increase
- In a billionfold way; by a billion degrees; on a scale of a billion; as, to multiply something a billionfold, to magnify something a billionfold, something which is a billionfold heavier than something else.
Both the adjective and the adverb are often used as hyperbole, indicating not literally a billion, but rather some vague inestimable number or amount.
billion + -fold