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struggle for existence

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noun
  1. the competition in nature among organisms of a population to maintain themselves in a given environment and to survive to reproduce others of their kind.
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Origin of struggle for existence

First recorded in 1820–30
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for struggle for existence

struggle for existence

noun
  1. (not in technical usage) competition between organisms of a population, esp as a factor in the evolution of plants and animalsSee also natural selection
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012