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other formal models have permitted .
<term>
Conversationally relevant descriptions
</term>
are
<term>
definite descriptions
</term>
#20189The model appears capable of accommodating the sort of reduplications that have been observed to occur in natural languages, but it excludes many of the unnatural constructions that other formal models have permitted.Conversationally relevant descriptions are definite descriptions that are not merely tools for the identification of a referent, but are also crucial to the discourse in other respects.