• (America) IPA: /ˈlɪni.əl/
• (British) IPA: /ˈlɪniːəl/

lineal (not comparable)

1. (family) Of a family relationship that includes mothers, fathers, daughters, sons, grandparents, grandchildren, etc., but not siblings; as opposed to collateral.
   • 1689 December (indicated as 1690)​, [John Locke], chapter 1, in Two Treatises of Government: […], London: […] Awnsham Churchill, […], OCLC 83985187 ↗:

     the prime and ancient right of lineal succession

2. Inheriting by direct descent; having the right by direct descent to succeed (to).
   • 1693, John Dryden, a poem included in William Congreve's play The Double Dealer

     for only you are lineal to the throne

3. Composed of lines; delineated.

   lineal designs

4. In the direction of a line; of a line; of or relating to a line; measured on, or ascertained by, a line; linear.

   lineal magnitude

• collateral

• line
• linear
• lineage