Definition: The word "Areius" refers to a Greek philosopher known for his philosophical ideas, particularly those that would later lead to the development of Stoicism. Areius was one of the first philosophers from ancient Greece who incorporated elements of classical philosophy into their own theories. Definition: Areius is best known as the author of the "De Anima", which is considered a foundational work in Stoic philosophy and includes philosophical arguments for the existence and essence of humanity. Areius' work is notable for its influence on later Stoic philosophers, who would continue to draw upon his ideas as they developed their own philosophies.