Definitions for "Free energy"
the thermodynamic quantity measuring the tendency of a reaction to proceed; also called Gibbs free energy.
The amount of energy in a reaction available to do work. Because most biochemical reactions occur at a constant temperature and pressure, the free energy is frequently the Gibbs Energy.
That energy which is available for doing useful work, after allowance has been made for the increase or decrease of disorder. Designated by the symbol (for Gibbs free energy), and defined by: = - TS, where = heat, = entropy, and = absolute (Kelvin) temperature.
the measure of ability of a system to undergo a spontaneous change
Keywords:  partition, function
The partition function