Lineal
Part of speech: adjective
Definition: Of a family relationship that includes mothers, fathers, sisters, brothers, daughters, and sons, etc. as opposed to collateral.
Linear
Part of speech: adjective
Definition: Having the form of a line; straight.Pertaining or related to lines.Made in a step-by-step, logical manner.Long and narrow, with nearly parallel sides.Of, or related to a class of polynomial of the form y = a.x + b .A type of length measurement involving only one spatial dimension .