heuristic; Hilbert David; Hippias; historicism; Hoagland Sarah Lucia; Hofstadter Douglas; homological - heterological; homonymous - synonymous - paronymous; Hopper Grace; Horkheimer Max; Horney Karen; humanism; Hume David; Husserl Edmund Gustav Albrech; Hutcheson Francis; hyle; hylomorphic; Hypatia; hypostasization; hypothesis; hypothetical syllogism - HS;