The width-to-height ratio of a film or television image.(noun)
The span-to-mean-chord ratio of an airfoil.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "aspect ratio" in a sentence
"The aspect ratio 16:9 was decided upon, compatible with widescreen movies shot in CinemaScope, Panavision or other anamorphic squeezed by the camera lens, then unsqueezed by the projector lens systems."