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Leucippus

(Encyclopedia)Leucippus lo͞osĭpˈəs [key], 5th cent. b.c., Greek philosopher. Aristotle believed that Leucippus inspired the atomistic theory with which Democritus is identified. Little is known about Leucippus....

substance

(Encyclopedia)substance, in philosophy, term used to denote the changeless substratum presumed in some philosophies to be present in all being. Aristotle defined substance as that which possesses attributes but is ...

Critias

(Encyclopedia)Critias krĭshˈēəs, krĭtēəs [key], c.460–403 b.c., Athenian political leader and writer. A relative of Plato, he was an aristocrat and had early training in philosophy with Socrates and wrote ...

apology

(Encyclopedia)apology [Gr.,=defense], literary work that defends, justifies, or clarifies an author's ideas or point of view. Unlike the ordinary use of the word, the literary use neither implies that wrong has bee...

Eubulides

(Encyclopedia)Eubulides yo͞obyo͞oˈlĭdēz [key], 4th cent. b.c., Greek philosopher, native of Miletus. He was a contemporary and adversary of Aristotle and was the successor of Euclid of Megara as head of the Me...

Antisthenes

(Encyclopedia)Antisthenes ăntĭsˈthənēz [key], b. 444? b.c., d. after 371 b.c., Greek philosopher, founder of the Cynics. Most of his paradoxical views stemmed from his early Sophist orientation, even though he...

Protagoras

(Encyclopedia)Protagoras prōtăgˈərəs [key], c.490–c.421 b.c., Greek philosopher of Abdera, one of the more distinguished Sophists. He taught for a time in Athens, where he was a friend of Pericles and knew S...

Aristophanes

(Encyclopedia)Aristophanes ărˌĭstŏfˈənēz [key], c.448 b.c.–c.388 b.c., Greek playwright, Athenian comic poet, greatest of the ancient writers of comedy. His plays, the only full extant samples of the Greek...

category, in philosophy

(Encyclopedia)category, philosophical term that literally means predication or assertion. It was first used by Aristotle, whose 10 categories formed a list of all the ways in which assertions can be made of a subje...

Scot, Michael

(Encyclopedia)Scot, Michael, c.1175–c.1234, medieval scholar, b. Scotland. He served as astrologer and physician at the court of Holy Roman Emperor Frederick II, where with other scholars he translated Aristotle ...