ap·er·ture 
/ˈæpɚtʃɚ/ noun
plural ap·er·tures /ˈæpɚtʃɚ/ noun [count] 1 formal : a hole or small opening in something
▪ We entered the cave through a narrow aperture. 2 technical : an opening that controls the amount of light that passes through a lens (such as a camera lens)
▪ The photograph was taken using a fast shutter speed and a large aperture.
▪ We entered the cave through a narrow aperture.
▪ The photograph was taken using a fast shutter speed and a large aperture.
