asynchronism asynch·ro·nism uncommon noun 1. the relation that exists when things occur at unrelated times “the stimulus produced a desynchronizing of the brain waves” Synonymsasynchronydesynchronizationdesynchronisationdesynchronizing Antonymssynchronism Related words Word family desynchronizedesynchronise Broader terms temporal relation WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.