a group of people assembled to sing together
"The entire choir formed a circle and sang in unison as the chorus entered the stage."
a body of dancers or singers who perform together
"The large chorus opened the musical by singing and dancing in perfect harmony on stage."
a company of actors who comment (by speaking or singing in unison) on the action in a classical Greek play
"In the ancient Athenian theater, the chorus moved around the orchestra to sing their collective commentary on the tragic events unfolding before them."
A group of singers and dancers in the religious festivals of ancient Greece.
"The chorus performed a sacred dance to honor Apollo during the ancient Greek festival."
In plain English: A chorus is the repeated part of a song that everyone sings together after each verse.
"The crowd sang along to the chorus at every concert."
Usage: As a noun, this word refers to a large number of people singing together rather than just one person's voice. It is often confused with "choir," which specifically denotes singers who perform sacred music under the direction of a conductor.
To sing or recite in chorus.
"The entire class stood up to sing the national anthem in chorus."
In plain English: To chorus is to shout something together with other people, usually during a song or protest.
"The audience started to chorus their cheers when he finally crossed the finish line."
The word entered English in the Middle Ages via Medieval Latin to mean a group of singers or dancers performing together. It shares a common origin with "choir," reflecting its roots in Ancient Greek for a circle dance accompanied by song.