1) Aerodynamics 2) Mechanics 3) The mechanics of air or gases 1) Aerodynamics 
Aeromechanics is the science about mechanics that deals with the motion of air and other gases, involving aerodynamics, thermophysics and aerostatics. It is the branch of mechanics that deals with the motion of gases (especially air) and their effects on bodies in the flow. The fluid flow and structure are interactive systems and their interaction...
• (n.) The science of equilibrium and motion of air or an aeriform fluid, including aerodynamics and aerostatics.
A`ër·o·me·chan'ics noun The science of equilibrium and motion of air or an aëriform fluid, including aërodynamics and aërostatics. 
[n] - the branch of mechanics that deals with the motion of gases (especially air) and their effects on bodies in the flow
aeromechanics The scientific study of air and other gases in motion or in equilibrium, including the two distinct branches of aerodynamics and aerostatics.
aerodynamics noun the branch of mechanics that deals with the motion of gases (especially air) and their effects on bodies in the flow
the mechanics of air or gases.