Does Imax mean 3-d

No, there are many other formats that you can watch movies, where it is in 3D.

Another Answer

IMAX 3D is 70mm film with a different aspect ratio than is used on standard screens that show 35mm film.

The IMAX 3D Experience is much larger, much more engaging, physically, than 3D on other screens, mostly because of its dramatically larger size relative to your eyes.

The IMAX 3D glasses frame the screen in such a way that you have only black peripheral vision, engaging your brain more completely through your eyes than mental and emotional engagement available when viewing a standard screen.