moderate
/ˈmä-d(ə-)rət/
adjective
avoiding extremes of behavior or expression : observing reasonable limits
calm, temperate
tending toward the mean or average amount or dimension
a moderate drinker
Though very much in favor of the measure, he expressed himself in moderate language.
verb
to lessen the intensity or extremeness of
to preside over or act as chairman of
to act as a moderator
the sun moderated the chill
noun
one who holds moderate views or who belongs to a group favoring a moderate course or program