lin·e·ar 
(lĭnē-ər)
(lĭnē-ər)adj.
1. Of, relating to, or resembling a line; straight.
2.
a. In, of, describing, described by, or related to a straight line.
b. Having only one dimension.
3. Characterized by, composed of, or emphasizing drawn lines rather than painterly effects.
4. Botany Narrow and elongated with nearly parallel margins: a linear leaf.
[Latin līneāris, from līnea, line; see LINE1.]
lin′e·ari·ty (-ârĭ-tē) n.
line·ar·ly adv.