Elegance

Portraying an air of beauty and maturity suggestive of an art form.
(Picture from rsg.net)

Element

A single movement that has a recognised way of performance and technical value.

Exchange

In multiples when apparatus is changed between gymnasts.

Execution

How well a routine is performed as opposed to the content of a routine.

Expression

To be able to project oneself as if on stage, to give an expressive and meaningful performance.

Extension

The amplitude of a gymnast's movements during the performance.