LASSO Meaning of LASSO in English n.Pronunciation: ' la-( ˌ )s ō , la- ' sü Function: transitive verb Date: 1807: to capture with or as if with a lasso : ROPE– las · so · er noun Merriam Webster Collegiate English Dictionary. Merriam Webster - Энциклопедический словарь английского языка. 2012