aspect ratio [aspect ratios](the ratio of an object's longest dimension to its next-longest dimension) noun [UK: ˈæ.spekt ˈreɪ.ʃɪəʊ] [US: ˈæ.spekt ˈreɪ.ʃiˌo.ʊ]
proportion [proportions](quantity that is part of the whole) noun [UK: prə.ˈpɔːʃ.n̩] [US: prə.ˈpɔːr.ʃn̩]
ratio [ratios](number representing comparison) noun [UK: ˈreɪ.ʃɪəʊ] [US: ˈreɪ.ʃiˌo.ʊ]