American Dictionary of the English Language

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LIN'EAR, adjective [Latin linearis.]

1. Pertaining to a line; consisting of lines; in a straight direction.

2. In botany, like a line; slender; of the same breadth throughout, except at the extremities; as linear leaf.

Linear numbers, in mathematics, such as have relation to length only; such is a number which represents one side of a plane figure. If the plane figure is a square, the linear figure is called a root.

Linear problem, that which may be solved geometrically by the intersection of two right lines.