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Concepts

Abstraction
Process of generalisation
Allegory of the cave
Allegory by Plato
Atomism
Natural philosophy
Causality
How one process influences another
Existence
Broad concept encompassing objective and subjective features of reality and existence
Existence
Ability of an entity to interact with physical or mental reality
Liminality
Quality of ambiguity, disorientation, or state of transition
Meaning of life
Philosophical and spiritual question concerning the significance of living or existence in general
Mental representation
Hypothetical internal cognitive symbol that represents external reality
Nondualism
Mature state of consciousness transcending dualism
Nothing
Concept denoting the absence of anything (at all) and associated with "nothingness"
Ontology
Branch of philosophy concerned with concepts such as existence, reality, being, becoming, as well as the basic categories of existence and their relations
Other (philosophy)
Concept in philosophy and psychology
Problem of universals
Philosophical question of whether properties exist, and if so, what they are
Reality
Sum or aggregate of all that is real or existent
Self
Individual person as the object of its own reflective consciousness
The Void (philosophy)
Manifestation of nothingness
Theory of mind
Ability to attribute mental states to oneself and others