What is fugacity?

fugacity (fu·gac·i·ty, /fyoo’ɡasədē/)
Chemistry: A thermodynamic property of a real gas that, if substituted for the pressure or partial pressure in the equations for an ideal gas, gives equations applicable to the real gas.
Words that rhyme with fugacity: audacity, capacity, mendacity, opacity, sagacity, tenacity, veracity.

“fugacity.” Oxford Dictionaries. Oxford University Press, 2016. Web. 5 Feb 2016.