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1. Designating or involving an equation whose terms are of the first degree
   - additive
    
2. Of or in or along or relating to a line; involving a single dimension
   "a linear measurement"
   - one-dimensional
    
3. Of a circuit or device having an output that is proportional to the input
   "linear amplifier"
   - analogue [Brit], analog
    
4. (of a leaf shape) long and narrow
   - elongate
    
5. Measured lengthwise
   - running

See also: bilinear, collinear, lengthways, lengthwise, lineal, linearity, linearly, linelike, rectilineal, rectilinear, simple, unsubdivided

Antonym: cubic, nonlinear, planar

Encyclopedia: Linear