Comment by shagie

https://www.britannica.com/dictionary/eb/qa/Everybody-Has-or...

> The words everybody and everyone are pronouns that describe a group of people, but grammatically they are singular. The last part of each word is a singular noun: body and one.

https://en.wikipedia.org/wiki/Encyclopædia_Britannica

> Though published in the United States since 1901, the Britannica has for the most part maintained British English spelling.