im·ag·ine / iˈmajən/ • v. [tr.] 1. form a mental image or concept of: imagine a road trip from Philadelphia to Chicago | I couldn't imagine what she expected to tell them. ∎ [often as adj.] (imagined) believe (something unreal or untrue) to exist or be so: they suffered from ill health, real or imagined, throughout their lives.2. suppose or assume: after Ned died, everyone imagined that Mabel would move away. ∎ [as interj.] just suppose: imagine! to outwit Heydrich!DERIVATIVES: i·mag·in·er n.