When an action stops something from happening, like assigning extra teachers to watch a playground during recess to prevent bullying, it's called prevention.

The noun prevention comes up most often when people are trying to keep something bad in check, like crime, disease, or forest fires. Educating kids about nutrition is one form of obesity prevention, for example, and lowering speed limits can help with accident prevention. The word prevent is at the root of prevention, and it comes from the Latin praeventus, "anticipate or hinder."

Definitions of prevention
  1. noun
    the act of preventing
    “money was allocated to study the cause and prevention of influenza”
    synonyms: bar
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    the act of preventing something from occurring
    the act of prevention by legal means
    the act of preventing someone from participating by finding them unqualified
    the act of intercepting; preventing something from proceeding or arriving
    non-proliferation, nonproliferation
    the prevention of something increasing or spreading (especially the prevention of an increase in the number of countries possessing nuclear weapons)
    forestalling, obviation, preclusion
    the act of preventing something by anticipating and disposing of it effectively
    the prevention of disease
    (sports) the act of preventing the opposition from scoring
    crushing, quelling, stifling, suppression
    forceful prevention; putting down by power or authority
    suspension, temporary removal
    a temporary debarment (from a privilege or position etc)
    recusal, recusation
    (law) the disqualification of a judge or jury by reason of prejudice or conflict of interest; a judge can be recused by objections of either party or judges can disqualify themselves
    severely repressive actions
    type of:
    hinderance, hindrance, interference
    the act of hindering or obstructing or impeding
Word Family

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