Definition:
A "preventive attack" is a military action taken to stop an enemy from doing something harmful or aggressive in the future. It is done before the enemy can attack, with the goal of protecting oneself or one’s country.
In more complex situations, a preventive attack can be seen as controversial because it involves taking action based on predictions or assumptions about future threats rather than waiting for an actual attack to occur.
While "preventive attack" specifically refers to military actions, the word "preventive" can also apply to other fields, such as healthcare (e.g., preventive medicine aims to prevent diseases).
"Strike first" - To take action before someone else does, similar in concept to a preventive attack.
"Get ahead of the game" - To act proactively in a situation to avoid problems later.
"Preventive attack" is a term used primarily in military contexts to describe actions taken to avoid future aggression. It can be a complex and debated concept, especially relating to ethics and international law.