1. (a.) Descending in a direct line from an ancestor; hereditary; derived from ancestors; -- opposed to collateral; as, a lineal descent or a lineal descendant.

2. (a.) Inheriting by direct descent; having the right by direct descent to succeed (to).

3. (a.) Composed of lines; delineated; as, lineal designs.

4. (a.) In the direction of a line; of or pertaining to a line; measured on, or ascertained by, a line; linear; as, lineal magnitude.

after arrowlike attendant cadet catenary clannish consecutive dead straight diphyletic direct ensuing ethnic even family flat following genealogical genetic gentile gentilic horizontal in a line junior later level linear national ordinal phyletic phylogenetic posterior progressive puisne racial rectilineal rectilinear right ruler-straight sequent sequential serial seriate smooth straight straight-cut straight-front straight-side streamlined subsequent succeeding successional successive totemic tribal TRUE unbending unbent unbowed unbroken uncurved undeflected undeviating undistorted uninterrupted unswerving unturned upright vertical younger