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1a mass of snow, ice, and rocks falling rapidly down a mountainside. a large mass of any material moving rapidly downhill:an avalanche of mud 2a sudden arrival or occurrence of something in overwhelming quantities:we have had an avalanche of applications 3 Physics a cumulative process in which a fast-moving ion or electron generates further ions and electrons by collision.
verb [no object]
1(of a mass of snow, ice, and rocks) descend rapidly down a mountainside. [with object] engulf or carry off by an avalanche:the climbers were avalanched down the south face of the mountain 2 Physics undergo a rapid increase in conductivity due to an avalanche process.