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Meaning of mental age

men'tal age'

Pronunciation: [key]
  1. the level of native mental ability or capacity of an individual, usually as determined by an intelligence test, in relation to the chronological age of the average individual at this level:Cf. a ten-year-old child with the mental age of a twelve-year-old; a mental age of twelve.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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