Abstract
An historicodevelopmental model of the acquisition order of words was applied to 175 words composing the Peabody Picture Vocabulary Test-Revised (PPVT-R; Form L). Results of a structural equation model, estimated using LISREL 7, demonstrated that the combination of date of entry, word length, polysemy, and frequency of usage accounted for a substantial proportion of the variance in acquisition order as defined by the item ordering in the PPVT-R (R 2 =.62). On the basis of goodness-of-fit indices, this model fits the data well (GFI =.924, NFI =.952, CFI =.976, IFI = .977), suggesting that the model presented provides a tenable explanation of variables underlying the acquisition order of words. This structural equation model provides further evidence for construct validity of the PPVT-R
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