moderation

noun4

1. •
   The state or quality of being moderate; avoidance of extremes.

   • ...It regulates and governs the Passions of the Mind, and brings them into due moderation and frame... — 1696
2. •
   An instance of moderating: bringing something away from extremes, especially in a beneficial way.

   • With the quick moderation of the weather some buying has appeared that had been held up because of the extremely cold weather […]. — 1936
3. •
   Usage of neutron moderator to slow down neutrons in a nuclear reactor.
4. •
   The process of moderating a discussion.

   • The moderation of a large online forum can be hard work.