a physical rather than subjective measure of the sharpness of a photographic image
acutance in American English
(əˈkjuːtns)
noun
a measure of the sharpness with which a film can reproduce the edge of an object
Word origin
[acute + -ance]-ance is a suffix used to form nouns either from adjectives in -ant or from verbs. Other words that use the affix -ance include: Renaissance, compliance, guidance, performance, variance