An example of academia is a college, its students, and its teachers.
Origin of academiaL: see academy
Origin of academiaNew Latin acadēmīa, from Latin, the Academy; see academy.
Latin acadēmīa, from Ancient Greek Ἀκαδημία (Akadēmia), a grove of trees and gymnasium outside of Athens where Plato taught; from the name of the supposed former owner of that estate, the Attic hero Akademos. See also academy, academe, Akademeia. Modern sense of "the world of universities and scholarship" recorded from 1956.