பொருள் : The minimum amount (of something) required to start or maintain a venture.
எடுத்துக்காட்டு :
The battle for the computer market has now reached critical mass.
There is now a critical mass of successful women to take the lead.
They sold the business because it lacked critical mass.
பொருள் : The minimum mass of fissionable material that can sustain a chain reaction.