Martin Heidegger summary

Phenomenology, a philosophical movement originating in the 20th century, the primary objective of which is the direct investigation and description of phenomena as consciously experienced, without theories about their causal explanation and as free as possible from unexamined preconceptions and

Existentialism, any of various philosophies, most influential in continental Europe from about 1930 to the mid-20th century, that have in common an interpretation of human existence in the world that stresses its concreteness and its problematic character. According to existentialism: (1) Existence

Ontology, the philosophical study of being in general, or of what applies neutrally to everything that is real. It was called “first philosophy” by Aristotle in Book IV of his Metaphysics. The Latin term ontologia (“science of being”) was felicitously invented by the German philosopher Jacob

Metaphysics, branch of philosophy whose topics in antiquity and the Middle Ages were the first causes of things and the nature of being. In postmedieval philosophy, however, many other topics came to be included under the heading “metaphysics.” (The reasons for this development will be discussed in