momentum
n. uncountable C1 Advanced Oxford US //moʊˈmɛntəm// UK //məʊmˈɛntəm// mo·men·tum
n. the force or speed that an object or a process has when it is moving. You use this to describe how something keeps going and becomes stronger over time.
n. the impetus gained by a moving object or the driving force behind a developing process. In its physical sense, it is the product of an object's mass and velocity.
The campaign is gaining momentum as more people join.
The startup gained significant momentum after securing a second round of funding from major investors.
While the initial policy shift was met with skepticism, it eventually gathered enough political momentum to pass through the legislature without further amendments.
Usage
Typically used with verbs like 'gain', 'gather', 'lose', or 'maintain'.