A more thorough explanation:

Definition: Contra libertatem matrimonii (pronounced kon-truh lih-buhr-tay-tuhm muh-truh-moh-nee-eye) is a Latin term that means "against freedom of marriage." This phrase was used historically to refer to marriage restraints that were considered illegal.

Examples: One example of contra libertatem matrimonii is when a person is forced to marry someone against their will. This is a violation of their freedom to choose their own spouse. Another example is when a government or religious institution prohibits certain individuals from getting married based on their race, religion, or sexual orientation. This is also a violation of their freedom to marry who they choose.

These examples illustrate how contra libertatem matrimonii was used to describe situations where people's freedom to marry was being restricted. It was often used in legal contexts to argue against marriage laws that were considered unjust or discriminatory.