To render (a thing) compact or more compact.
To become compact or more compact.
To adjust a theory so as to render finite or periodic (a theoretical space-time dimension).
To enlarge (a topological space) in order to render it compact.
To compress; to compact; to press into something or pack together.
To stamp or impress onto something.
To collide or strike, the act of impinging.
To significantly or strongly influence or affect; to have an impact on.
A significant or strong influence or effect.
A forced impinging.
The striking of one body against another; collision.
The force or energy of a collision of two objects.