Search millisecond (msec) millisecond (msec) /-sek′ənd/ [L, mille, thousand; ME, seconde, small part] , one thousandth (10−3) of a second. Tweet Telegram VK Random Words T cell antigen receptor periodontal -chondroma motor root complete fracture vibratory sense globulin puberulic acid Eating Disorders Inventory (EDI-3)