everyone
pron.every person in a group. You use it when you are talking about all the people in a place or situation.
pron.every person; all people in a particular group or the world at large.
“Everyone in the class passed the test.”
“The party was a huge success and everyone had a wonderful time dancing.”
“While the policy was designed to benefit the majority, it soon became clear that everyone involved would need to make significant sacrifices to ensure its long-term success.”
Always takes a singular verb despite referring to multiple people.
everyone vs every one — Everyone refers to all people in a group, while every one singles out each specific person or thing.
Even though it refers to many people, the pronoun is grammatically singular and requires a singular verb.
Usage everyone else · everyone affected · everyone knew
From Middle English everichon. By surface analysis, every + one.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.