χορός

Chorus comes from Greek χορός (choros), meaning 'a dance, a dance-floor, a group of dancers and singers.' The word's deepest root names physical movement in a circle — the communal, rhythmic motion of bodies performing together. Before it was a theatrical convention, the choros was a religious and social practice: groups of singers and dancers performing in unison at festivals, weddings, funerals, and agricultural celebrations. The circular dance was one of the oldest forms of collective expression in Greek culture, depicted on Geometric-period pottery from the eighth century BCE and described in Homer's Iliad, where Hephaestus crafts a dancing floor on the shield of Achilles. The chorus in Greek theater emerged directly from these ritual dances. The earliest dramatic performances were probably choral — a group singing and dancing in the orchestra (itself from orcheisthai, 'to dance') — before individual actors separated from the group to create dialogue.