1not denoting, involving, or arranged in a straight line. Mathematics designating or involving an equation whose terms are not of the first degree. Physics involving a lack of linearity between two related qualities such as input and output. Mathematics involving measurement in more than one dimension. not linear, sequential, or straightforward; random:Joyce’s stream-of-consciousness, nonlinear narrative 2of or denoting digital editing whereby a sequence of edits is stored on computer as opposed to videotape, thus facilitating further editing.