| Academics | Philosophers of the third and second centuries B.C. in what had been Plato's Academy; they had the reputation of maintaining that all things are inapprehensible.
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| Agoge | Way of living.
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| Ataraxia | The goal of unperturbedness and tranquility of mind that was considered the highest good by ancient thinkers such as the Skeptics.
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| Conceptualism | The theory that universals are concepts and exist only in the mind.
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| Creation Ex nihilo | Creation "out of nothing."
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| Epoche | Suspension of judgment concerning the truth or falsity of a proposition.
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| Hellenistic age | The period of Macedonian domination of the Greek-speaking world from around 335 B.C. to about 30 B.C.
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| Hypatia | Instructed students in Plato, Aristotle, Plotinus, and Ptolemy and improved the mathematical rigor of Ptolemy's astronomical theories, stressing the importance of philosophy and mathematics to life.
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| Modified skeptic | A skeptic who does not doubt that at least some things are known but denies or suspends judgment on the possibility of knowledge about some particular subject.
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| Neoplatonism | A further development of Platonic philosophy under the influence of Aristotelian and Pythagorean philosophy and Christian mysticism; it flourished between the third and sixth centuries, stressing a mystical intuition of the highest One or God, a transcendent source of all being.
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| Nominalism | The theory that only individual things are real.
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| Plotinus | Held that reality emanates from the One.
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| Principle of noncontradiction | The principle that a proposition and its contradictory cannot both be true and one or the other must be true.
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| Pyrrho | Held that every theory can be opposed by an equally valid contradictory theory; we must suspend judgment on all issues.
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| Pyrrhonists | Members of a school of philosophical skepticism in the Hellenistic and Roman periods who attempted to suspend judgment on all knowledge claims.
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| Realism | The theory that the real world is independent of the mind.
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| Sextus Empiricus | The most famous total skeptic. He held the position "I do not know whether knowledge is possible."
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| Skepticism (capital "s") | A school of philosophy that emerged in the Hellenistic and Roman periods after Plato; included the Academics and the Pyrrhonists.
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| skepticism (lowercase "s") | The doctrine that true knowledge is uncertain or impossible.
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| St. Augustine | Provided Platonic philosophical justification for the Christian belief in a nonmaterial God, rejected skepticism, and diagnosed the cause of error in sense perception.
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| St. Thomas Aquinas | Blended Christianity with the philosophy of Aristotle, delineating the boundary between philosophy and theology.
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| Stoicism (lowercase "s") | The practice of a stoic, one who is indifferent to pleasure and pain.
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| Teleological explanation | An explanation of a thing in terms of its ends, goals, purposes, or functions.
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| Ten Tropes | A collection of ten arguments by the Skeptics against the possibility of knowledge.
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| Total skeptic | One who maintains nothing can be known or, alternatively, suspends judgment in all matters.
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| Universals | Some words are general and apply to more than one thing, for example, "tree," "philosopher," "horse." The problem of universals concerns how these words could have meaning.
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