Some definitions:

representation
The ways ideas are portrayed through texts (English Stage 6 Syllabus)
representing
The language mode that involves composing images by means of visual or other texts. These images and their meaning are composed using codes and conventions. The term can include such activities as graphically presenting the structure of a novel, making a film, composing a web page, or enacting a dramatic text. (English Stage 6 Syllabus)
representation
Textual construction that arise from habitual ways of thinking about or acting in the real world (Literary Terms, Brian Moon)
representation
The ways texts are constructed in the media to reflect certain events, stories and groups (The Media Student’s Handbook, Gill Branston and Roy Stafford)
representation
A fluid, two-way process between producer and audience in relation to reality and its relationship to reality. (Media and Reality, Allan Thompson)