Using friendship studies from the perspectives of philosophy, psychology, history, classics, political science, sociology, ethology, neuroscience, semiotics and other disciplines, the volume uses the encyclopedic format to construct both a positive ontology (based on empirical evidence) of friendship, as well as discussing friendship's "negative ontology" (i.e., its uncertainties, ambivalences, unknowns, and ineffable aspects), to outline a multidisciplinary comparative approach to different philosophical models of friendship (e.g., ancient Greek, Indian, Roman, modern), and to explore the inner connection between friendship and philosophy (...) (as a way of life and a friendship with wisdom). Among the emergent categories are 1. Issues (e.g., money, mutuality, satisfaction). 2. Models (e.g., the ancient Greek, the Indian, the modern model of friendship). 3. Kinds or types of friendship (e.g., bad friends, noblest friendship, typologies). 4. Incoherence of theoretical typologies (e.g., complexity, ineffability, thisness). 5. Technical terms (e.g., bestowal, friend-shield effect, homophily). 6. Theories, accounts (e.g. Silver’s thesis, Dunbar’s number, mirror account of friendship). 7. Cases of friendships (e.g., Achilles and Patroclus, Murdoch’s friends, famous friends). 8. Philosophers on friendship (e.g., Aristotle, Kant, Weil). 9. Motifs and themes (e.g., gift, pleasure, social media). 10. Concepts (e.g., eros, presentism, tacit knowledge). 11. Proverbs (e.g., Faroese, Jamaican, Swahili proverbs). 12. Friendship studies (e.g., anthropology, history, semiotics of friendship). (shrink)