While describing the dynamics of cell growth, the ratio of change...

The absolute growth rate is defined as the measurement and comparison of total growth per unit time. In the context of cell growth dynamics, it is expressed as the ratio of the change in the number of cells (\Delta N$) to the time interval (\Delta t$) over which the change occurs.

Relative growth rate, on the other hand, is the growth per unit time expressed on a common basis, such as per unit initial parameter.

Answer: Absolute Growth Rate