Third person singular present tense of alleviate; reduces or lessens the severity of something unpleasant.
From Old French alever (to raise, lighten), from Latin ad- (to) + levis (light). The -ates ending shows present tense, third person singular.
Medicine uses 'alleviates' constantly because alleviating is actually medicine's primary job—most drugs don't cure, they just make the symptoms bearable while your body does the real healing.
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