\Re`ge*la"tion\ (-l?"sh?n), n. [Pref. re- + L. gelatio a freezing.] (Physics) The act or process of freezing anew, or together,as two pieces of ice. Note: Two pieces of ice at (or even) 32? Fahrenheit, with moist surfaces, placed in contact, freeze together to a rigid mass. This is called regelation. --Faraday.