1. Of or in or along or relating to a line; involving or having a single dimension
   "a linear measurement";
   - one-dimensional
    
2. (mathematics) designating or involving an equation whose terms are of the first degree
   "The problem could be solved using a linear equation";
   - additive
    
3. 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
   "The linear leaves of the grass swayed in the breeze";
   - elongate
    
5. Measured lengthwise
   "cost of lumber per linear foot";
   - running
    
6. Progressing in a direct sequence without diversion
   "The plot follows a linear narrative"

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

Antonym: cubic, planar

Encyclopedia: Linear