the act, state, of deluding or being deluded; a false opinion or belief, especially one that may be a symptom of madness

misconception, misbelief

wild or extravagant creative thought or mental pictures

imagination, dream

a feeling of desire, trust, confidence; to expect and desire something that is possible

longing; dream

(the seeing of) something that does not really exist; a false or impossible idea

false appearance; false belief

existing only in the mind and not real

fictitious, invented

(an instance, occasion, of) a condition of being lost in dreamy, pleasant thoughts

daydream