Imaginary/ɪˈmædʒɪneri/ Definition 1 of 2Pro Tip 1/3Creative Concepts Use 'imaginary' for ideas or entities created in one's mind not found in reality. As a child, I had an imaginary kingdom. Pro Tip 2/3Not Factual 'Imaginary' indicates something is not based on factual evidence. His plan to become a millionaire by tomorrow is purely imaginary. Pro Tip 3/3Involve Emotions People may have strong emotional connections to imaginary places or characters. Her imaginary world was a peaceful escape from stress.