A more thorough explanation:

Term: Medium Concludendi
Definition: Medium Concludendi is a legal term that refers to the reason or cause of an action. It is the basis on which a legal case is built.
Examples: If someone sues another person for breach of contract, the medium concludendi would be the contract itself. In a criminal case, the medium concludendi would be the crime that was committed.
Explanation: The examples illustrate that medium concludendi is the foundation of a legal case. It is the reason why someone is taking legal action against another person. In the first example, the medium concludendi is the contract that was breached, and in the second example, it is the crime that was committed. Without a medium concludendi, there would be no legal case.