You write it as one word: Everyone enjoyed the concert. You use every one when you mean 'every person or thing in a group, considered as separate people or things'. The meaning of EVERYONE is every person : everybody.

Understanding the Context

How to use everyone in a sentence. (Definition of everyone from the Cambridge Advanced Learner's Dictionary & Thesaurus ยฉ Cambridge University Press) You use everyone to refer to all people. Everyone feels like a failure at times. Everyone needs some free time for rest and relaxation.

Key Insights

There is no difference in meaning between everyone and everybody, but everyone is more common in written English, and everybody is more common in spoken English. Everyone has heard of it. However, similar to what occurs with collective or group nouns like crowd or team, sometimes a plural pronoun refers back to everyone which is also reflected in verb conjugations: Everyone was laughing at first, but then they all stopped. Definition of everyone pronoun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Final Thoughts

Care should be taken to distinguish between everyone as a single word and every one as two words, the latter form correctly being used to refer to each individual person or thing in a particular group: every one of them is wrong