Main entry: direct, lineal
Definition: in a straight unbroken line of descent from parent to child
Usage: lineal ancestors; lineal heirs; a direct descendant of the king; direct heredity
Antonyms: indirect, collateral
Definition: descended from a common ancestor but through different lines
Antonyms: multilateral, many-sided
Definition: having many parts or sides
Main entry: lineal
Definition: arranged in a line
Antonyms: three-dimensional, cubic
Definition: having three dimensions
Antonyms: planar, two-dimensional
Definition: involving two dimensions
Antonyms: nonlinear
Definition: designating or involving an equation whose terms are not of the first degree