(noun) quality of being moderate and avoiding extremes. Synonyms: moderateness.
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Noun Definition 1
(noun) a change for the better. Synonyms: easing, relief.
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Noun Definition 2
(noun) the trait of avoiding excesses. Synonyms: temperance.
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Noun Definition 3
(noun) the action of lessening in severity or intensity. Synonyms: mitigation. Example: "The object being control or moderation of economic depressions."