Single Trigger Acceleration
Acceleration of vesting based on a single, specified, event, such as an acquisition or change of control. To be contrasted with double trigger acceleration, which is acceleration based on two events–such as a change of control and being terminated within a certain period of time after a change of control.
Double Trigger Acceleration
Acceleration of vesting based on two (2) events–first, an acquisition or change of control, followed by a termination of service (usually without cause).


