1. (noun)problem, job a state of difficulty that needs to be resolved "she and her husband are having problems"; "it is always a job to contact him"; "urban problems such as traffic congestion and smog"
2. (noun)problem a question raised for consideration or solution "our homework consisted of ten problems to solve"
3. (noun)trouble, problem a source of difficulty "one trouble after another delayed the job"; "what's the problem?"