Nagel Ernest; Nagel Thomas; natural law; naturalistic fallacy; necessary - contingent; necessary - sufficient; negating the antecedent and the consequent; negative proposition; neikos; neoplatonism; neo-Thomism; Neurath Otto; neutral monism; Newton Isaac; Nicole Pierre; Nietzsche Friedrich; nihil est in intellectu quod non prius fuerit in sensu; nihilism; Noddings Nel; noesis; nominalism;