Origin: French suffix -oir
Choir has 6 different meanings across 2 categories:
a chorus that sings as part of a religious ceremony
"The choir sang traditional hymns during the Sunday church service."
the area occupied by singers; the part of the chancel between sanctuary and nave
"The ancient stone choir, situated between the main nave and the altar, was filled with chanting monks during Vespers."
Singing group; group of people who sing together; company of people who are trained to sing together.
"The church choir performed a beautiful hymn during the evening service."
In plain English: A choir is a group of people who sing together as part of an orchestra, church service, or performance.
"The choir sang beautifully during the Sunday church service."
Usage: A choir is an organized singing ensemble, often associated with religious services or classical music performances. Do not confuse it with a "chorus," which can refer either to the same type of group in musical contexts or simply to the repeated final lines of a song.
To sing in concert.
"The choir sang in concert to celebrate the holiday season."
The word choir comes from the Latin chorus, which originally meant a "company of dancers or singers." Its modern spelling was later influenced by the related words chorus and the French chœur.