1. designating or involving an equation whose terms are of the first degree

Similar word(s): bilinear, additive

2. of or in or along or relating to a line; involving or having a single dimension

- a linear measurement

Similar word(s): collinear, lineal, linelike, rectilineal, rectilinear

3. of a circuit or device having an output that is proportional to the input

- linear amplifier

Similar word(s): analog, analogue

4. (of a leaf shape) long and narrow

Similar word(s): simple, unsubdivided, elongate

5. measured lengthwise

Similar word(s): lengthways, lengthwise, running

Sentences with linear as an adjective:

- a linear meter