There are several synonyms for the word "rebatement" which means a reduction or decrease. Some common synonyms for "rebatement" are abatement, mitigation, alleviation, relaxation, moderation, and diminution. Abatement refers to a decrease in intensity or quantity. Mitigation means to make something less severe or painful. Alleviation means to ease or lessen a burden. Relaxation signifies a release from tension. Moderation means to temper or reduce in intensity. Diminution refers to a reduction in size, amount, or intensity. All of these synonyms convey the idea of a reduction or decrease, but each carries a slightly different connotation or shade of meaning.