Definitions
1.NounThe point at which a slow, reversible change becomes irreversible, often with dramatic consequences.
2.NounA point in time when a group rapidly and dramatically changes its behavior by widely adopting a previously rare practice.
The point in time at which some new technology becomes mainstream.
3.NounThe point in time at which some new technology becomes mainstream.
4.NounAn irreversible change in the climate system.