A more thorough explanation:

Definition: Solemnity is a serious and formal state of being that is required by law or tradition to validate an agreement or action. It can also refer to the state of being respectful and observant.

Example 1: The solemnity of marriage requires a formal ceremony to make it legally binding.

Example 2: The signing of a contract is a solemn occasion that requires all parties to be serious and respectful.

Explanation: In both examples, solemnity refers to the seriousness and formality required by law or tradition to validate an agreement or action. In the case of marriage, a formal ceremony is required to make the union legally binding. In the case of a contract, all parties must be serious and respectful during the signing process to ensure that the agreement is valid and enforceable.