noun
a person who dreams, especially one who indulges in extravagant dreams or fantasies
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The young dreamer was always lost in thought, imagining a better world.
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My friend is such a dreamer, always talking about big plans for the future.
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That guy is a total dreamer, always thinking he's going to be a famous actor.
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She was a dreamer, with her head in the clouds and her heart set on the stars.