Truth (noun)

1. The quality or state of being in accordance with fact or reality.
2. A statement proven to be or accepted as true.

Origin:

Middle english trewthe, from old english triewð; akin to old high german triuwida truth.

Examples:

1. She wants to find the truth about her past.
2. He wants to find the truth about the world.
3. The truth about the event was revealed.
4. The truth about the situation was uncovered.
5. The truth about the crime was solved.