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1. (mathematics) 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 or having a single dimension
   "a linear measurement";
   - one-dimensional
    
3. (electronics) Of a circuit or device in which the value of a data item is represented by a continuously variable physical quantity rather than digitally
   "linear amplifier";
   - analogue [Brit], analog
    
4. (of a leaf shape) long and narrow
   - elongate
    
5. Measured lengthwise
   "cost of lumber per linear foot";
   - running

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

Encyclopedia: Linear