noun
the process of becoming smaller or reducing in amount
verb
present participle of the verb 'lessen', meaning to make or become smaller in size, amount, degree, or intensity
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The implementation of new safety measures led to a lessening of workplace accidents.
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Eating healthier and exercising regularly can result in a lessening of body fat.
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I've noticed a serious lessening in the drama since she stopped hanging out with that group.
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As time passed, the lessening of his grief allowed him to move forward with his life.