mod·er·a·tion
ˌmädəˈrāSH(ə)n/
noun
noun: moderation
1.
the avoidance of excess or extremes, especially in one's behavior or political opinions.
"he urged the police to show moderation"
synonyms: self-restraint, restraint, self-control, self-command, self-discipline; More
the action of making something less extreme, intense, or violent.
"the union's approach was based on increased dialogue and the moderation of demands"
synonyms: relaxation, easing (off), reduction, abatement, weakening, slackening, tempering, softening, diminution, diminishing, lessening; More
2.
PHYSICS
the retardation of neutrons by a moderator.
Origin
late Middle English: via Old French from Latin moderatio(n-), from the verb moderare ‘to control’ (see moderate).