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illusion (noun) false idea or belief.
When you have an illusion about some person, or a situation, you have a wrong idea or belief about them. You are under the illusion that someone will help you if you believe wrongly that they will help you. You are going to be disappointed if you are under such an illusion. You are under an illusion about yourself if you have false impressions of your own greatness, abilities, etc..
- The professor warned the student not to be under the illusion that she was impressed with his performance.
- Herman had been under the illusion that Lucy loved him until one fine morning she invited him to her wedding with Jeffrey.