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MORPHOLOGY: a property of (word formation) rules which entails that they are able to generate entities which are fully well-formed, but are not attested or used by the native speakers of a language. EXAMPLE: if the rule for -al affixation may derive attested forms such as arrival and refusal as well as unattested forms such as derival and describal, we say that the -al rule overgenerates.
LIT. Halle, M. (1973)
Spencer, A. (1991)