mass balance1
/ˈmas ˌbaləns/noun
1 Aeronautics. A state in which inertial coupling between the angular movement of a control surface and other degrees of freedom of an aircraft is eliminated, so avoiding flutter of the surface.
2The change in mass occurring in an object, system, or component of a system over a particular period of time.
Origin
1930s. From mass + balance. Compare slightly earlier mass-balance.
mass-balance2
/ˈmasˌbaləns/Aeronautics
verb
[with object] To bring about a state of mass balance in (a control surface).
Origin
1930s; earliest use found in Flight International. From mass + balance.