achievement age

age (āj)

1. the duration, or the measure of time, of the existence of a person or object.

2. the measure of an attribute relative to the chronological age of an average normal individual.

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achievement age  the age of a person expressed as the chronologic age of a normal person showing the same proficiency in study.

bone age  osseous development shown radiographically, stated in terms of the chronological age at which the development is ordinarily attained.

chronological age  the measure of time elapsed since a person's birth.

fertilization age  the age of a conceptus defined by the time elapsed since fertilization.

gestational age  the age of a conceptus or pregnancy; in human clinical practice, timed from onset of the last normal menstrual period. Elsewhere the onset may be timed from estrus, coitus, artificial insemination, vaginal plug formation, fertilization, or implantation.

mental age  the age level of mental ability of a person as gauged by standard intelligence tests.

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a·chieve·ment age (-chvmnt)

n.

The level of an individual's educational accomplishment as measured by standard achievement tests and expressed as the age in years of a child for whom the total score would be an average score.

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achievement age (AA)

[əchēv′mənt]

the level of a person's educational development as measured by an achievement test and compared with the normal score for chronologic age. Compare mental age. See also developmental age.