Wiktionary
billionfold
a. A billion times so; adv. 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.
Usage examples of "billionfold".
And the gateways, of course, were placed at points of gravitational focusing, in order to exploit the billionfold gain available there.