To collide or strike, the act of impinging.
When the hammer impacts the nail, it bends.
To compress; to compact; to press into something or pack together.
The footprints of birds do not impact the soil in the way those of dinosaurs do.
To influence; to affect; to have an impact on.
I can make the changes, but it will impact the schedule.
To stamp or impress onto something.
Ideas impacted on the mind.