linear vs lineal

linear and lineal both are adjectives.

Word	Noun	Adjective	Verb	Adverb
linear	No	Yes	No	No
lineal	No	Yes	No	No

linear (adjective)	lineal (adjective)
of or in or along or relating to a line; involving or having a single dimension	in a straight unbroken line of descent from parent to child
designating or involving an equation whose terms are of the first degree	arranged in a line
of a circuit or device having an output that is proportional to the input
measured lengthwise
(of a leaf shape) long and narrow