Rapid increase

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1640s, noun of action from pullulate .\n

Wiktionary Word definitions in Wiktionary
n. A teeming, swarming, or multiplying.

WordNet Word definitions in WordNet
n. asexual reproduction in which a local growth on the surface or in the body of the parent becomes a separate individual [syn: gemmation ] a rapid and abundant increase

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Pullulation \Pul`lu*la"tion\, n. [Cf. F. pullulation.] A germinating, or budding. --Dr. H. More.