of, consisting of, or using lines: linear design.
pertaining to or represented by lines: linear dimensions.
extended or arranged in a line: a linear series.
involving measurement in one dimension only; pertaining to length: linear measure.
of or pertaining to the characteristics of a work of art in which forms and rhythms are defined chiefly in terms of line.
having the form of or resembling a line: linear nebulae.
consisting of, involving, or describable by terms of the first degree.
having the same effect on a sum as on each of the summands: a linear operation.
Electronics. delivering an output that is directly proportional to the input: a linear circuit; a linear amplifier.
threadlike; narrow and elongated: a linear leaf.

1635–45; < Latin līneāris of, belonging to lines. See line1, -ar1

linearly, adverb
nonlinear, adjective
sublinear, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
linear (ˈlɪnɪə)
1.  of, in, along, or relating to a line
2.  of or relating to length
3.  resembling, represented by, or consisting of a line or lines
4.  having one dimension
5.  Compare painterly designating a style in the arts, esp painting, that obtains its effects through line rather than colour or light and in which the edges of forms and planes are sharply defined
6.  maths of or relating to the first degree: a linear equation
7.  narrow and having parallel edges: a linear leaf
8.  electronics
 a.  (of a circuit, etc) having an output that is directly proportional to input: linear amplifier
 b.  having components arranged in a line
[C17: from Latin līneāris of or by means of lines]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1640s, from L. linearis "belonging to a line," from linea "string, line" (see line (n.)). Linear A and Linear B (1902-3) were names given to two related forms of linear Minoan writing discovered 1894-1901 in Crete by Sir Arthur Evans. Related: Linearity.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

linear lin·e·ar (lĭn'ē-ər)
Of, relating to, or resembling a line; straight.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
linear   (lĭn'ē-ər)  Pronunciation Key 
Being or resembling a line.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The linear rhythm of the planters' sides repeats in the interlocking bench seat.
Shortly after you move away from the entrance, you're propelled upward at high
  speed by the linear motor.
Linear time disappears in favor of a poetic meditation upon the object, and
  within it, a curious juxtaposition of imagery.
To be sure, there is neither a simple nor linear cause-and-effect relationship
  between social psychology and historical events.
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