IMAG'INE, L. imaginor, from imago, image.
1. To form a notion or idea in the mind to fancy. We can imagine the figure of a horse's head united to a human body.
In this sense, fancy is the more proper word.
2. To form ideas or representations in the mind, by modifying and combining our conceptions.
3. To contrive in purpose to scheme to devise.
How long will ye imagine mischief against a man? Psalms 62
IMAG'INE, To conceive to have a notion or idea. I cannot imagine how this should have happened.