reversion
noun
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a failure to maintain a higher statebacksliding
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returning to a former stateretrogressionretroversionregressionregress
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turning in the opposite directionreversalturnaboutturnaroundreverse
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a reappearance of an earlier characteristicatavismthrowback
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a return to a normal phenotype, usually resulting from a second mutationβThe only explanation for the natural coat color was a reversion.β
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(law) an interest in an estate that reverts to the grantor (or his heirs) at the end of some period (e.g., the death of the grantee)