General Definition: 1. A wavy or irregular line drawn on a flat surface, or any thing or any action directly or indirectly associated with this, especially a graph or an audiogram. As a Noun: 1. A mathematical diagram, usually a line or curve, which shows how two or more sets of numbers or measurements are related. English = graph. 2. A graphic representation of the acuteness of someone's hearing in a range of sound frequencies. English = audiogram. 3. As a Verb or Adjective: 1. To draw a graph.