— struggler. struggle /ˈstrʌgəl/ noun. plural struggles. struggle. /ˈstrʌgəl/. noun. plural struggles. Learner's definition of STRUGGLE. 1. [count] : a long effort to do, achieve, or deal with something that is difficult or that causes problems. a struggle to succeed. a struggle against injustice [=an effort to stop injustice]. the struggle for civil rights/freedom/survival.