Webster's English Dictionary

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linear

lin.ear \'lin-e--*r\ \.lin-e--'ar-*t-e-\ \'lin-e--*r-le-\ aj 1a1: relating 
   to, consisting of, or resembling a line : STRAIGHT  1a2: involving a single 
   dimension  1b1: of the first degree in any number of variables {~ equation} 
    1b2: based on or involving linear equations  1c: characterized by an 
   emphasis on line {~ art}  2: elongated with nearly parallel sides {~ leaf}  
   3: involving or expressed by a linear equation; esp : having or be ing a 
   response or output that is directly proportional to the input - 
   lin.ear.i.ty n