action

N. in court, when one person sues someone else to:

- defend or enforce a right,

- stop something bad from happening or fix something, or

- punish them for a crime.

Unlike criminal proceedings - where the State almost always has the role of prosecuting individuals who are alleged to have broken the criminal law, in a civil action one party takes proceedings against another party.

A civil action can be brought if a person defames you or trespasses on your land.

http://www.yourrights.org.uk/yourrights/how-to-enforce-your-rights/civil-action-and-judicial-review/civil-action.html