A more thorough explanation:

Definition: Ad ostium ecclesiae means "at the church door" in Latin. In legal terms, it refers to a wife's right to a life estate in one-third of the land that her husband owned in fee upon his death. This right was traditionally recognized by common law and could not be taken away by any transfer made by the husband during his lifetime. Example: If a husband owned a piece of land and died, his wife would have the right to live on and use one-third of that land for the rest of her life. This right would be recognized at the church door, meaning it was a legal right that could be enforced in a court of law. Explanation: The example illustrates how ad ostium ecclesiae was used in the context of dower, which was a legal concept that protected a wife's rights to her husband's property after his death. The phrase "at the church door" refers to the traditional practice of announcing legal rights and obligations in a public place, such as a church, where everyone could hear them. This ensured that the rights of the wife were recognized and respected by the community.