Imagining or daydreaming about something that isn't real; creating fantasy scenarios in your mind.
From 'fantasy' (Greek 'phantasía' meaning imagination or appearance), plus '-ize' making it a verb, plus '-ing' for the present participle. The word literally means 'making imaginary.'
Neuroscience shows that fantasizing activates the same brain regions as actually doing something—your motor cortex fires when you imagine running—which is why athletes use visualization training; your brain partially believes the fantasy.
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