To imagine is defined as to make a guess at or make a mental image of something.(verb)
An example of to imagine is envisioning all people living peacefully.
See imagine in Webster's New World College Dictionary
Origin: ME imaginen < OFr imaginer < L imaginari < imago, a likeness, image
See imagine in American Heritage Dictionary 4
verb i·mag·ined, i·mag·in·ing, i·mag·ines verb, transitive
Origin: Middle English imaginen
Origin: , from Old French imaginer
Origin: , from Latin imāginārī
Origin: , from imāgō, imāgin-, image; see aim- in Indo-European roots.
Learn more about imagine