noun
a thing that someone believes to be real but that exists only in their imagination
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The idea of time travel remains a mere figment of the imagination in the scientific community.
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I always thought unicorns were just a figment of fairy tales until I saw one in a movie.
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I thought my friend's story about meeting a celebrity was just a figment of his imagination.
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His dreams of becoming a famous musician were just a figment of his ambition.