Definitions of automatic
an automatic machine or process is one that works independently of human control
The Company's Series C Preferred Stock is subject to automatic conversion to Common Stock.
by default and without the possibility of being changed by human intervention
Under the plans, anyone aged over 18 caught with a knife twice would receive an automatic six-month jail sentence.
done without thinking about it or without actively meaning to do it, often because of habit
It was just an automatic reaction, carried out in self-defence.