Definition of Balancing the System

Does anyone have an accurate definition of the above?
Thanks,
Peter

TAB - “Testing, Adjusting & Balancing”

SMACNA - “sheet metal and air conditioning contractors national Association Inc.”

Adjusting the supply air flow to achieve at or near the same temperature in every room during the current season.

The process and results would vary depending on who did the work, homeowner, contractor, engineer or scientist.