1 a form a mental image or concept of. b picture to oneself (something non-existent or not present to the senses).
2 (often foll. by to + infin.) think or conceive (imagined them to be soldiers).
3 guess (cannot imagine what they are doing).
4 (often foll. by that + clause) suppose; be of the opinion (I imagine you will need help).
5 (in imper.) as an exclamation of surprise (just imagine!).
Derivatives:
imaginer n.
Etymology: ME f. OF imaginer f. L imaginari (as IMAGE)
Useful english dictionary. 2012.