Academy is a type of secondary or tertiary education institutions.
The word comes from the Academy in ancient Greece, which derives from the Athenian hero, Akademos. Outside the city walls of Athens, the gymnasium was made famous by Plato as a center of learning. The sacred space, dedicated to the goddess of wisdom, Athena, had formerly been an olive grove, hence the expression "the groves of Academe."
In these gardens, the philosopher Plato conversed with followers. Plato developed his sessions into a method of teaching philosophy and in 387 BC, established what is known today as the Old Academy.
By extension academia has come to mean the cultural accumulation of knowledge, its development and transmission across generations and its practitioners and transmitters. In the 17th century, British, Italian and French scholars used the term to describe types of institutions of higher learning.
In ancient Greece, after the establishment of the original Academy, Plato's colleagues and pupils developed spin-offs of his method. Arcesilaus, a Greek student of Plato established the Middle Academy. Carneades, another student, established the New Academy. In 335 BC, Aristotle refined the method with his own theories and established the Lyceum in another gymnasium.