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The example sentences of RAREFACTION in videos (2 in total of 2)

ВЛАДА А4 сожрали ЛЮДОЕДЫ ? Нашли куски мяса А4 ! ПРОНИКЛИ В ДОМ ПОЖИРАТИЛЕЙ ! English (US)
production noun, singular or mass that preposition or subordinating conjunction went verb, past participle there existential there and coordinating conjunction vlad proper noun, singular didn proper noun, singular ’ t proper noun, singular have verb, non-3rd person singular present it personal pronoun by preposition or subordinating conjunction chance noun, singular or mass there existential there was verb, past tense a determiner rarefaction noun, singular or mass , which wh-determiner was verb, past tense just adverb
Andrew Hall: Handbag of the Gods | Space News English (US)
thrusting verb, gerund or present participle forward adverb at preposition or subordinating conjunction the determiner head noun, singular or mass of preposition or subordinating conjunction the determiner storm noun, singular or mass and coordinating conjunction the determiner fractal adjective pattern noun, singular or mass of preposition or subordinating conjunction rarefaction noun, singular or mass and coordinating conjunction compression noun, singular or mass

Definition and meaning of RAREFACTION

What does "rarefaction mean?"
rarefaction

/ˌrerəˈfakSH(ə)n/

noun
Decrease in the density of something.