We provide experimental evidence in support of a theory of English definite
descriptions that incorporates both uniqueness and familiarity components.
We find that these components are not weighted equally; in particular, the
effect of familiarity is weaker. Our results best support a hybrid theory
of definiteness in the spirit of Farkas’ (2002) notion of determined
reference where both uniqueness and familiarity provide cues to reference
resolution, but which requires a probabilistic specification of how
familiarity is achieved in context.