Eccentricity of Ellipse is the ratio of the linear eccentricity to the semi major axis of the Ellipse. And is denoted by e. Eccentricity of Ellipse is usually measured using the Meter for Length. Note that the value of Eccentricity of Ellipse is always positive. Typically, the value of Eccentricity of Ellipse lies in the range from 0 to 1.