Definition of mass-balancing in US English:

mass-balancing

noun

Aeronautics
  • The action of adjusting a control surface to bring about a state of mass balance; the state of being mass-balanced.

Origin

1930s; earliest use found in Journal of the Royal Aeronautical Society. From mass-balance + -ing.

Pronunciation

mass-balancing

/ˈmasˌbalənsɪŋ/