Pronunciation: (lin'ē-ur),[key] —adj. 1. of, consisting of, or using lines: linear design. 2. pertaining to or represented by lines: linear dimensions. 3. extended or arranged in a line: a linear series. 4. involving measurement in one dimension only; pertaining to length: linear measure. 5. of or pertaining to the characteristics of a work of art in which forms and rhythms are defined chiefly in terms of line.
6. having the form of or resembling a line: linear nebulae. 7. Math. a. consisting of, involving, or describable by terms of the first degree.
b. having the same effect on a sum as on each of the summands: a linear operation. 8. Electronics.delivering an output that is directly proportional to the input: a linear circuit; a linear amplifier. 9. threadlike; narrow and elongated: a linear leaf.