an act or instance of marking with or tracing by lines.
a division into lines.
an outline or delineation.
an arrangement or group of lines.

1350–1400; Middle English lyneacion < Late Latin līneātiōn- (stem of līneātiō) the drawing of a line, Latin: direction, line. See lineate, -ion Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lineation (ˌlɪnɪˈeɪʃən)
1.  the act of marking with lines
2.  an arrangement of or division into lines
3.  an outline or contour
4.  any linear arrangement involving rocks or minerals, such as a parallel arrangement of elongated mineral grains

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
In many places the rock has a strong quartz-rod lineation, and locally, two foliations.
The lineation is not horizontal, but is tilted down toward the southwest at an angle of several degrees.
Typically is compositionally homogeneous, with strong foliation and locally well-developed lineation defined by major minerals.
It has a heterogeneous and in places, contains cognate and foreign xenoliths aligned parallel to an apparent flow lineation.
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