• (a.) In a imaginary manner; in imagination.
Im·ag'i·na·ri·ly adjective In a imaginary manner; in imagination. B. Jonson. 
imaginary, imaginarily, imaginariness 1. Existing only in the imagination. 2. Lacking factual reality; such as, imaginary fears or imaginary illness. 3. Relating to or containing imaginary numbers, or being the coefficient of the imaginary part in a complex number.