Many debates in biomedical ethics today involve inconsistencies in defining the key term, person. Both sides of the abortion debate, for instance, beg the question about what constitutes personhood. This book explores the arguments concerning definitions of personhood in the history of modern philosophy, and then constructs a superior model, defined in terms of distinctive features (a theoretical concept borrowed from linguistics). This model is shown to have distinct advantages over the necessary and sufficient condition models of personhood launched by essentialists. Philosophers...