Lineal (adjective)

1. Relating to or in a direct line of descent.
2. Relating to or descended directly from an ancestor.

Origin:

From the latin word "linea" meaning a line or series.

Examples:

1. The lineal descendant was the only heir to the throne.
2. The lineal ancestry could be traced back to the 18th century.
3. The lineal descent was traced through the mother's side of the family.
4. The lineal relationship was clear and easy to trace.
5. The lineal inheritance was passed down through the generations.