This is the 10685th most frequent Russian word.
воочию
"Воочию" means "with one's own eyes" or "in person."
The word 'воочию' is used to emphasize experiencing something directly with one's own eyes, in person.
Я видел его воочию, когда он выступал на сцене.
I saw him in person when he performed on stage.
Here, 'воочию' highlights the necessity of direct visual experience to fully grasp something.
Только воочию можно понять красоту этого места.
Only by seeing this place in person can one understand its beauty.
In this case, 'воочию' underscores the direct and personal nature of the experience being recounted.