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Speciation, the formation of new and distinct species in the course of evolution. Speciation involves the splitting of a single evolutionary lineage into two or more genetically independent lineages.
1. deviation-a variation that deviates from the standard or norm; the deviation from the mean. departure, difference, divergence. variation, fluctuation-an instance of change; the rate or magnitude of change. variance, variant, discrepancy-an event that departs from expectations.eviation. n. 1. an act or result of deviating. 2. (Statistics) statistics the difference between an observed value in a series of such values and their arithmetic mean.