Essentializing Inferences

Predicate nominals (e.g., ‘is a female’) seem to label or categorize their subjects, while their predicate adjective correlates (e.g, ‘is female’) merely attribute a property. Further, predicate nominals elicit essentializing inferential judgments about inductive potential as well as stable explanatory membership. Semantic data and research from developmental and cognitive psychology support that this distinction is robust and productive. I argue that while the difference between predicate nominals and predicate adjectives is elided by standard semantic theories, it ought not be. I then develop and defend a psychologically motivated semantic account that takes predicate nominals to involve attributing kind membership and to trigger a presupposition that underpins our essentialist judgments.