Of or pertaining to or characteristic of the ancient Greek and Roman cultures; "classical WordNet 3.0

Of or pertaining to or characteristic of the ancient Greeks and Romans, especially their art, literature, or culture Open English WordNet

Of or pertaining to the ancient Greeks and Romans, especially to Greek or Roman authors of the highest rank, or of the period when their best literature was produced; of or pertaining to places inhabited by the ancient Greeks and Romans, or rendered famous by their deeds. Wiktionary

Of or pertaining to the ancient Greeks and Romans. Wiktionary (translation)

Greek and Roman. Wiktionary (translation)