Critical mass and Turning point

Critical mass noun - The minimum amount (of something) required to start or maintain a venture.

Turning point and critical mass are semantically related in crucial point topic. In some cases you can use "Turning point" instead a noun phrase "Critical mass".

Turning point noun - A point in a chain of events at which an important change (as in one's fortunes) occurs.

Critical mass and turning point are semantically related in critical juncture topic. You can use "Critical mass" instead a noun phrase "Turning point".