Classical Greek is the term often used to describe the ancient Greek language, culture, and civilization from approximately the 5th century BCE to the 3rd century CE. However, there are several synonyms that can be used interchangeably to refer to this period. Some of the most common synonyms for Classical Greek include Ancient Greek, Hellenic Greek, Attic Greek, and Koine Greek. While each of these terms may refer to slightly different aspects of the Greek culture, they are all generally used to describe the period of antiquity when Greek civilization was at its peak and produced some of the most influential works of literature, philosophy, and art in human history.