The word someone refers a person or an individual, but not necessarily a specific one. If you're not hungry enough for dessert after lunch, you can ask the friends at your table, "Does someone want my ice cream sandwich?"

It's a funny contradiction, but the noun someone can be used to mean "any unspecified person," but also "a very important person." So a child might say, "When I grow up, I want to be someone," meaning that they want to be well-known or famous, or just really good at something. Someone and somebody are synonyms, so you can use them interchangeably, although someone is slightly more formal.

Definitions of someone

n a human being

individual, mortal, person, somebody, soul
Type of:
being, organism
a living thing that has (or can develop) the ability to act or function independently
causal agency, causal agent, cause
any entity that produces an effect or is responsible for events or results

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