A person who accepts something as true or real; someone who has faith in a religion or cause.
From Old English 'gelyfan' (to believe), combined with the agent suffix '-er.' The word originally meant 'to hold dear or esteem,' then evolved to mean 'accept as true.'
Historically, calling someone a 'believer' was loaded with religious meaning, but today we use it for everything from climate change to conspiracy theories, showing how language adapts to modern anxieties.
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