What does entail mean?

From thefreedictionary.com: “en·tail (n-tl, n-) tr.v. en·tailed, en·tail·ing, en·tails

1. To have, impose, or require as a necessary accompaniment or consequence: The investment entailed a high risk. The proposition X is a rose entails the proposition X is a flower because all roses are flowers.
2. To limit the inheritance of (property) to a specified succession of heirs.
3. To bestow or impose on a person or a specified succession of heirs. n. 1. a. The act of entailing, especially property. b. The state of being entailed.
4. An entailed estate.
5. A predetermined order of succession, as to an estate or to an office.
6. Something transmitted as if by unalterable inheritance.”