Visualisation
Part of speech: noun
Definition: The act of imagining or visualizing something.
Visualization
Part of speech: noun
Definition: The act of visualizing, or something visualized.The visual representation of data.
Example sentence: Growing up, I did quite a bit of reading on the mental side. My dad, who coached me, had us doing a lot of different types of mental work, like visualization. I read a couple of tennis books that talked about calming your nerves, belief, visualization, relaxing, breathing.