Meaning of IMAX in English
[ 'ʌɪmaks ]
■ noun trademark a cinematographic technique which produces an image approximately ten times larger than that from standard 35 mm film.
1960s: from i- (prob. representing a pronunciation of eye ) + max (short for maximum ).
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004