/ Dictionary / Index N nonlinearity: Meaning and Definition of Find definitions for: non•lin•e•ar•i•ty Pronunciation: (non"lin-ē-ar'i-tē), [key] — n. the quality of a function that expresses a relationship that is not one of direct proportion. deviation of an input-output relationship from one of direct proportionality. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nonlife non liquet Related Content Daily Word Quiz: belligerent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language