Definition of IMAX in US English:

IMAX

noun

trademark
  • A technique of widescreen cinematography which produces an image approximately ten times larger than that from standard 35 mm film.

    as modifier ‘IMAX theaters’

Origin

1960s: from i- (probably representing a pronunciation of eye) + max (short for maximum).

Pronunciation

IMAX

/ˈīˌmaks/