Foundation (noun)

1. The basis or groundwork of anything.
2. An underlying principle, belief, or feeling.
3. The act of establishing something or the state of being established.
4. The lowest load-bearing part of a building, typically below ground level, on which the structure is built.
5. An institution or organization established for a specific purpose, such as education, research, or charity.

Origin:

From middle english foundacioun, from old french fondation, from latin fundatio, from fundare ("to found, establish"), from fundus ("bottom, foundation") + -ation. compare french fondation, italian fondazione, spanish fundación.

Examples:

1. The foundation of the building is made of concrete.
2. The foundation of a good education is reading and writing.
3. The company has a solid foundation.
4. The foundation of our relationship is trust.
5. She works for a charitable foundation.