A more thorough explanation:

Definition: Esnecy (es-ni-see) is a term used to describe seniority, which refers to the condition, right, or privilege of the eldest-born. It is a term that is commonly used to describe the privilege of the eldest among coparceners to make a first choice of shares upon a voluntary partition. It is also known as aesnecia.

One example of esnecy is when a family decides to divide their property among their children. The eldest child has the right to choose their share first, followed by the second eldest, and so on.

Another example is in the royal family, where the eldest child is often the heir to the throne and has the privilege of ruling the country.

These examples illustrate how esnecy is related to seniority and the privilege of being the eldest-born. It is a term that is often used in legal and royal contexts to determine the order of succession or division of property.