A more thorough explanation:

Definition: Within the year of mourning. This referred to the one-year period of mourning during which a widow was prohibited from remarrying.

Example: After her husband passed away, Maria was in infra annum luctus and could not consider remarrying until the year of mourning was over.

This term is used in historical contexts to describe the period of mourning that widows were expected to observe before remarrying. It was a cultural tradition that was enforced by law in some societies.

Definition: Within the state.

Example: The new law only applies infra civitatem, meaning it only affects residents of the state.

This term is used in legal contexts to describe the jurisdiction of a law or regulation. It indicates that the law only applies within the boundaries of a particular state or region.