D defs.my
Entry 3 senses Webster, 1913

nonlinear

· IPA /nɑnlˈɪnˌiːər/
01 adj. Not depictable graphically as a straight line; not changing by a constant amount for each unit of time, distance, or other independent vari…
  1. 1.
    Not depictable graphically as a straight line; not changing by a constant amount for each unit of time, distance, or other independent variable. Opposite of linear.(Math.)
  2. 2.
    Containing variables of greater than the first degree; -- of an equation. Opposite of linear.(Math.)
  3. 3.
    Represented by equations containing variables of greater than the first degree; -- of physical processes or relationships. Opposite of linear.(Physics)