Definition of Academy ratio in English:

Academy ratio

noun

Cinema
  • The (former) standard film aspect ratio of 1.375:1 (also written as 1.37:1).

    This aspect ratio was adopted by the Academy of Motion Picture Arts and Sciences in 1932 and used for all Hollywood films until the 1950s when widescreen ratios (e.g. 1.66:1, 1.85:1, etc.) became popular.

Origin

1950s; earliest use found in International Projectionist.