A more thorough explanation:

Definition: The act of calling upon for authority or justification. It can also refer to the act of enforcing or using a legal right.

Example 1: During the graduation ceremony, the principal gave an invocation, asking for blessings and guidance for the graduates as they move forward in their lives.

Example 2: The lawyer made an invocation of the contract clause to support their argument in court.

These examples illustrate how invocation can be used in different contexts. In the first example, the principal is calling upon a higher power for guidance and support. In the second example, the lawyer is using a legal right to support their argument. In both cases, invocation is the act of calling upon something for authority or justification.