ˈ ̷ ̷ˌ ̷ ̷ noun
1. : the point in one method of chlorinating drinking water at which the amount of available chlorine in the water falls to a minimum and after which it increases proportionately with the amount of chlorine being added indicating that most of the undesirable tastes and odors have been removed
2. : a point (as in a process) at which an interruption can be made