(1):
(a.) In the direction of a line; of or pertaining to a line; measured on, or ascertained by, a line; linear; as, lineal magnitude.
(2):
(a.) Composed of lines; delineated; as, lineal designs.
(3):
(a.) Inheriting by direct descent; having the right by direct descent to succeed (to).
(4):
(a.) Descending in a direct line from an ancestor; hereditary; derived from ancestors; - opposed to collateral; as, a lineal descent or a lineal descendant.