Lineal

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. Descending in a direct line from an ancestor; hereditary; derived from ancestors; — opposed to collateral; as, a lineal descent or a lineal descendant.
3. a. Inheriting by direct descent; having the right by direct descent to succeed (to).
4. a. Composed of lines; delineated; as, lineal designs.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.