a.

1. 线的，直线的；使用线的
   a linear design

   线条图案

2. 长度的
   linear measurements

   长度

3. 线状的；【植】线形的
   a linear leaf

   长叶片

4. 【数】一次的；线性的
5. 【化】线性的

adj.

1. arranged in or extending along a straight line.
   ▸consisting of lines or outlines.
   ▸involving one dimension only.
2. sequential:
   a linear narrative.
3. Mathematics  able to be represented by a straight line on a graph.
   ▸involving directly proportional change in two related quantities.