What Does Acceleration Mean?

What does acceleration mean? This means that, should the company be acquired, what happens to the portion of your stock that is not yet vested? Does it get accelerated? Do you get it all immediately? Or do you have to wait even utill post acquisition and stay at the acquire while you continue to vest into that value. People get all bent around the axle around whether you ave acceleration or single or double or trigger acceleration. The reality is it doesn't matter that much what you have in the documents because an m ana acquirer is going to renegotiate everything at the time of acquisition.