pullulation

/ˌpʌljʊˈleɪʃən/

pullulation means A teeming, swarming, or multiplying. Lexicurio rates it Sui generis — a strength score of 85 out of 100.

pullulation is pronounced /ˌpʌljʊˈleɪʃən/.

Why “pullulation” is a great word

PULLULATION — [Noun] The process of sprouting, breeding, and swarming forth in teeming abundance. From the Latin verb 'pullulare' ("to sprout, bring forth young, swarm") + the English noun-forming suffix '-ion'. Unlike "proliferation," which foregrounds rapid numerical increase, or "swarm," which describes the resultant dense group, pullulation captures the primal, generative chaos itself. It is the silent cellular seething in a vat of yeast, the sudden greening eruption of buds on a spring bough, and the insistent murmur of half-formed schemes in a crowded café—life’s quiet, relentless arithmetic of becoming.

Etymology

From pullulate + -ion.

noun

A teeming, swarming, or multiplying.“[The cats] took not the slightest notice of either Mr. Flay or of himself save for the sudden cessation of their purring. When they had stood in the darkness, and before Mr. Flay had removed the bunch of keys from his pocket, Steerpike had imagined he had heard a heavy, deep throbbing, a monotonous sea-like drumming of sound, and he now knew that it must have been the pullulation of the tribe.”