Dynamic equilibrium refers to a balanced state where opposing forces or processes are happening at the same rate, resulting in no net change. It is like a constant back-and-forth motion but with no overall change. Full definition
Instead we should think of them as being in a state of dynamic equilibrium with the outside world, an equilibrium point that is constantly shifting in response to a changing environment. (scientificamerican.com)
This shows that there was some kind of dynamic equilibrium between atmospheric and biogenic / oceanic compartiments with continuous and seasonal exchanges only modulated by temperature. (jennifermarohasy.com)
However you still have to define LTE (local Thermodynamic Equilibrium) and its physical characteristics before you can go on to describe LDE (Local Dynamic Equilibrium) were things ARE varying. (wattsupwiththat.com)