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  Animism (Greeks)
  Alcmaeon (fl. ca. 500 B.C.)
  Antisthenes (ca. 445 - 365 B.C.)
  Analogy of the divided line
  Allegory of the cave
  Aristotle (384 - 322 B.C.)
  Active reason
  Associationism (Aristotle)
  Aristarchus of Samos (ca. 310 - 230 B.C.)
  Avicenna (980 - 1037)
  Abelard, Peter (1079 - 1142)
  Averroes (1126 - 1198)
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