What does it mean to find an eagle feather?

it means you found a feather don't know of any othe meaning

There are many Native American tribes, and interpretations can vary widely. Some think it is an omen of luck or good fortune. Some regard it as their personal totem. It is held in high regard by most tribes, as in some tribes only Chiefs are allowed to wear them, in others.as a sign of merit to warriors. There is no one answer to this question. I hope some Native Americans will provide more and better info for you. I gave a bald eagle feather to my neighbor from the Blackfeet tribe, and he did tell me if it had been dropped on the floor of a house, it must be purified by their Medicine Man. I found a fallen[shed] wing feather in the forest and kept it in a poster tube til I could find an appropriate recipient. I respect what is sacred to others.

Pleased be advised... it is illegal in the United States for anyone not of provable (a band number) Native American blood to possess the feathers of endangered, or protected birds or those of the eagle. Serious fines are attached to breaking this law.