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| a chattering or flighty, light-headed person. |
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| achievement age | |
| —n | |
| psychol Compare mental age the age at which a child should be able to perform a standardized test successfully | |
achievement age a·chieve·ment age (ə-chēv'mənt)
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.