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Adjective: lineal  li-nee-ul
  1. In a straight unbroken line of descent from parent to child
    "lineal ancestors"; "lineal heirs";
    - direct
  2. Arranged in a line

See also: linear, matrilineal, matrilinear, one-dimensional, patrilineal, patrilinear, related, unilateral

Antonym: collateral

Encyclopedia: Lineal