voltage rise time (of a transistor) (trv)

The time interval during which the collector (or drain) voltage changes from 10% to 90% of its peak on-state value, ignoring spikes caused by interaction with other components or parasitics, e.g., freewheeling-diode recovery current and parasitic inductance.

References: 

JESD24, 7/85
JESD77-B, 2/00