Intensity definition.

By The Free Dictionary
http://www.thefreedictionary.com/intensity
in·ten·si·ty (n-tns-t)
n. pl. in·ten·si·ties
1. Exceptionally great concentration, power, or force.
2. Physics The amount or degree of strength of electricity, light, heat, or sound per unit area or volume.
3.
a. The strength of a color, especially the degree to which it lacks its complementary color.
b. See saturation.

All you warriors need to know this.
Ace.