1. To lighten or lessen the force or weight of. [Obs.] Should no others join capable to alleviate the expense. Evelyn. Those large bladders . . . conduce much to the alleviating of the body [of flying birds]. Ray. 2. To lighten or lessen (physical or mental troubles); to mitigate, or make easier to be endured; as, to alleviate sorrow, pain, care, etc. ; -- opposed to aggravate. T...